My first time requesting MA so be gentle but honest!
MA kind of depends on what you are trying to achieve. If your objective was to cruise down the slope at consistent intermediate speed with a nice leisurely medium radius line, and a regular rhythm then you, no worries, you are already there.
I'm going to assume your objective in taking lessons is something like "help me ski better" and I'm going to guess that you probably aren't planning to start running gates. So I'm going to suggest a logical progression is to develop a more rounded turn shape and use grip and line to control speed for this type of terrain at roughly the same speed and turn radius.
Couple of point:
1. You are wearing a jacket that is hiding a good portion of your body making it a little harder to see what's happening when you are up close
2. The pitch is variable
For those reasons I'm going to focus on turns on the pitch just above and a little back from the camera. Your turns are symetrical so this applies both sides.
Between pic 1 and 2 you have created separation by pivoting the skis under a stable upper body. That bit is good.
However we see that you are already starting to move inside and that's more visible in pic 3.
By pic 4 that early inside hip and a rigid inside leg is reducing your options. I suspect your hip is inside and twisted to face further to the outside and you are no longer predominantly balanced over the outside ski, you've lost grip and are pushing the heels out.
Heels out and sliding across the direction of travel.
Leading to a defensive braking for speed control.
So, if your objective becomes what i suggest there's a few things to work on:
1. More mobility in lower joints (ankles/knees/hips) and greater independence of leg use.
2. Keeping over your outside ski in preference to moving straight to the inside to allow you to grip and finish your turns.
There's a host of drills for this type of development. Here's one related to keeping over the outside ski.
Hope this helps.