Hey there! It's a little hard to see your equitation because of the sweatshirt, but I'll tell you what I can.
You look nice and soft through your back and stirrup length is good for equitation on the flat. I like the lively trot, and you both look comfortable and relaxed.
One thing to work on is softening through your elbows and hands so that they follow the movement of his head a little better. If you look closely, you can see that they are a little stiff and look a little jerky as you post. If you can soften those hands up, I bet Diesel will be more willing to bring his nose in. Your hands are also a little low -- there should be a nice straight line from your elbow to the bit.
Your leg looks pretty tight, but it needs to come back underneath you a bit to provide added support. There should be a straight line from your ear through your shoulder and hip and down the back of your heel. Lots of two-point (without supporting your weight with his neck) will help strengthen your legs.
Diesel looks like a nice horse and you are working well together, so just work on those small polishing details. Keep up the good work!