@AJM, yes as others have pointed out, you do have too much weight on your inside ski. In this pic, that's your left ski. To prove this, look at the snow spray coming off your skis. It looks like both skis are producing the same amount of spray. Meaning, that inside ski is as heavy on the snow as the outside ski.
How to fix? Lift your inside shoulder and hand to lean a little sideways, outward, downhill, towards the outside ski. Your torso will end up vertical instead of leaning sideways.
Right now your torso is leaning sideways, up the hill, to the inside of the turn. This is a common thing people do. It helps to edge the skis. What's really happening is you are leaning your whole body to get the skis edged, leaning it as a unit. This works, it edges the skis, and people feel confident leaning into the turn this way. But, it puts weight on both skis. Higher level skiing focuses weight on the outside ski.
There are reasons to have that outside ski carrying most of your weight. On hard snow it's essential to have the outside ski fully weighted in order to maintain its grip on the snow. "Leaning in" on hard snow makes your turns more skidded that most people would like. It lessens control and that lessens the feeling of security. But in this pic you are not on hard snow, so that advantage is not so important.
Learning to keep your torso vertical means you don't have to lean your whole body left then right then left then right and so on all the way down the hill. When you are making long turns, as it looks like you're doing in this pic, that left-right leaning doesn't pose a problem.
But if you want to be able to make short turns, leaning everything left-right repeatedly is a non-starter. It takes too much time to lean left for left turns and right for the next turn. Short turns can't be made. Learning to edge your skis without involving your upper body will open up the possibility of making short radius turns. So teach yourself to keep that torso more upright.
Those short radius turns are the way to get down something steepish with less speed. You'll spend less time heading down the fall line when you make short turns. If steeps give you the shakes, learn to make short radius turns and you'll be able to get down them with a good sense of control and with less mind-boggling speed. And that means you can't lean in. Lean out.
I'm not sure you are skiing back-seat. Your arms are forward, your shins are tilted forward relative to the skis, and your spine's tilt matches your shin tilt. The snow spray under your skis starts up front, ahead of your boots. That's pretty difficult to get to happen if there's little weight on the fronts of your skis.
But, you look like you are going pretty fast, and your skis don't look bent even though you are at the bottom of the turn where the forces are strongest. So you could benefit from having more weight on those shovels to get the skis bent. Bending the skis helps you get a rounder turn with a shorter turn radius than this pic indicates you've got. That roundness and a shorter radius will help you get downhill more slowly on pitches where you'd prefer to go slower and feel more in control of those skis. Being able to make short turns is an important skill for a skier building higher level skills.
How to get weight more forward? Close those ankles up more, as has been pointed out upthread already. Bend them more forward - inside the boots. Keep your heels seated as you do this; do not let your heels get light. Do this ankle-bending not to force the cuffs to flex forward, but to move your entire body above the ankles forward. It only takes a little more ankle-bend to get the whole body to shift more forward. Then its weight will hover farther over the fronts of the skis than evident in this pic. That forward body-weight position in turn will bend your skis. Your cuffs will probably flex too. Flexing the cuffs is a sign that you have your body weight hovering far enough forward to bend the front of the skis. And if you've kept your heels solidly down on the backs of your boot soles, the backs of the skis will be weighted enough to be part of the bend in the skis. You need the backs weighted as well as the fronts to get a good bend.
When you bend your ankles forward with more ooomph, continually as you ski, holding them more bent, you'll feel more solid tongue-shin pressure. You'll also feel your muscles maintaining that bend. Those two things will tell you that you're successful in holding the forward flex of the ankles. The official word is "dorsiflex." You can train yourself to do this, but it takes time and concentration. Spend time on easier terrain working on maintaining your dorsiflexion. That's where you can keep your mind on this task. Do this for a bit every day. Then when you go up the hill, you can do what an instructor friend of mine does to help keep those ankles solidly dorsiflexed. She repeats out loud with each turn "more tongue-shin" "more tongue-shin" "more tongue-shin." It works for her. Maybe it will work for you.
Good for hubby for getting this image. Next time talk him into getting video. Have him stand on the side of the run and video you as you come down from above, as you pass him, and also as you head away downhill from him. Be sure you pass him far enough away so he can get your head and your skis in the image. That side view is short in duration but very important for discerning any back-seat issues.