Evaluating from the feet upward...'cuz the ski/snow interaction is what it's all about.
--Why is your stance so wide? A stance that wide makes it much harder to retract your inside leg. More weight on the outside ski makes it bend more for better turning. Try a stance that is walking-width wide. Drill with the tail of your inside ski lifted off the snow. Ski with the inside ski on the snow very lightly. Vertical separation of your feet is good in the turn...it happens when that inside leg is retracted to put more pressure on the outside ski. Too much horizontal separation of the feet make it difficult to get that pressure on the outside ski.
--Why so much inside tip lead? That much tip lead tends to put some people back on their heels, and makes it harder to edge the inside ski. Try pulling back all the time on your inside foot while continually tipping it to more edge and more edge--lift the inside big toe off the snow very early and continually lift the inside foot big toe very much. Drill with your feet as much side-by-side as you can, then relax them and find the position that gives you the best pressure to work the tips of your skis on the snow and gives you inside foot edging ability. It is necessary to begin edging with the inside foot, because weaker muscles tip the foot out vs. tipping it in. If you start with the weaker muscle group (lifting the inside foot big toe off the snow), the stronger muscle group (lifting the outside foot little toe) will have no trouble keeping up. Too much big toe pressure will tend to cause the ski to lose grip.
--Try pushing the inside hip forward (but not the inside foot) as soon as you begin making the new turn. This added counter will help the tail of your outside ski grip the snow better.
--Your bend at the waist doesn't look excessive for the amount of angulation you have, which is necessary to balance with the good angles you're getting to the snow. The alternative would be to incline your body inward in the turn, and that reduces ski edge grip. As you ski more, you'll find the correct balance point that works the best and doesn't feel unnatural.
--Sometimes your outside shoulder is good 'n low, and sometimes it isn't as low as it could be. Vice versa for your inside shoulder...sometimes it could be higher.
--Those are wild arms. Find an arm movement and pole plant philosophy and stick to it. I prefer the elbows closer to the body and the hands out. (For a drill, hold the elbows tight against the body. After the drill, retain that basic position but relax the arms.) Grip the ski pole quite firmly. Plant way down the hill but not too far forward of your feet. With the elbow near your side and the firm grip, reaching downhill with the pole creates a tension in your arm and side that tends to pull that outside shoulder down--good. Tap the pole tip into the snow with that firm grip in a position the correctly positions your body, then let it come out of the snow in a way that does not incorrectly position your body.
--In a suitable spot, at the end of each turn pick out a landmark on the side of the run and switch your skis to their other edges before you allow them to change direction. This will slow your twitchy feet. You'll need to put in a very early angulation to achieve this.
--Do what you need to do for certification, but for your skiing, especially in the gates, learn retraction turns. How would you like to do recreational skiing and gates something like this