Looks good. You've got some solid fundemental carving skills down. Now it's time to step it up a notch.
The rising up in transition (cross-over) carves you've got going on is great for the straight down the fall line carving you're doing on gentler slopes. Work it a little harder, with more leg compression at the apex of the carve (sink "into" the carve / bend the knees more), and with earlier, more full extension coming off the carve. Also, it would be good to see the toeside carve initiated more with the knees (knees lunging towards ground) and heelsides led with the hips, and less with upper body guidance. Tilt the board's edge angle higher, as well. In that hero snow, it will easily hold and you'll carve tighter. Also, keep the upper body more vertical, especially on those toesides. Try to only allow your upper body to dip towards the snow if you're knees start actually hitting the snow. Overall, try to ride lower, with more knee bend. There's a bit of trailing arm flapping going on, which you'll settle down. No biggie.
Now, if you're using that same stand up/cross-over technique on steeps or ice, that's where you'll run into trouble, as you won't be able to control your speed. So, start working on the opposite; dropping your upper body in the transitions (cross unders), and extending your legs at the apex of the carve. Your body overall will be much lower to the ground. At the same time, start riding your carves out more fully, perpendicular to the fall line. For practice, make a point not to change edges until your board comes dead across the fall line. That will 1) control your speed more, and 2) teach you to confidentently roll onto your downhill edge when it is straight across the fall line (something you tried desperately to avoid when you were first learning to ride). Start trying to set your downhill edge and initiating carves as early, quickly, and hard as you can as you're going across the fall line. Turn intiation at the top of the carve is a key to controlling speed on steeps (at least without resorting to skidding or falling leaves).
Once you've got that, step it up again, and in the transitions, not only drop your upper body, but simultaneously relax your knees to raise your board / bring it in closer to you (cross-through). You'll basically "suck your body in" through the transitions. That is the fastest way to change edges in a carve, and it becomes very versatile. On the steeps, you'll ride your carves out across the fall line and make fast cross-through edge changes to manage your speed. On flatter runs, you can open up the carve and ride more down the fall line. If you thought cross-overs were snappy, wait until you fall-line carve with cross-throughs! You're letting the board provide the rebound now instead of pumping with your legs. Often when you relax your knees in fall line carving transitions, they'll literally come up to your chest and you'll catch air, along with a sense of weightlessness. You'll need to extend them fully just to grab purchase again, before you sink down going into the next carve. Fun stuffs becomes funner stuffs as you improve, but it does become become more exerting and even a workout. You're gettin' it. Now just keep workin' at it 'till you got it.