You're fine direct reining until you learn how to neck rein. If you are going to direct rein though, you want to put your pinky behind the rein like the other poster said. Eyes up, heels down and bend your wrists out a bit so your thumb is facing the sky
Stirrups are very short for the western. So you look like you are pushed back because of that (lots of space between you and the horn, and no between you and back of the saddle). Although it's certainly instructor's fault, not yours. Other than that (and keeping heels little too high, which is normal for the beginners (and not only, actually lol!)) you look really good: relaxed and straight.
Welcome to the wonderful world of riding and horses.
When teaching young or new riders, I like them to have their sturipps a little shorter to give them more support when they are riding.
I also would not expect someone who is on a horse for the first time, to have the skill to ride with one hand, that comes later when you have more balance.
But you look wonderful for your first time. I am sure you have improved a lot. Keep up the good work.