I can't tell from the photos, but it looks like you are riding without a curb chain/strap. Is that so?
You are looking down, a lot. Even outside of the one standing photo, for the most part you are looking down, and your hands are so far forward and down that the whole focus of your energy, and thus the horse's, will be downward, onto his forehand.
If you can move your hands back , close to being just above or just barely in front of the horn, put a little bend in your elbow, look up and trust your hrose to move forward without you looking down to see what's going on with his head , it will achieve a better result.
The last photos is adorable! He is a lovely horse and you make a really nice pair.
Oh, and you also seem to be kind of pushed back against the cantle of the saddle. I see a lot of air in front of you. Try centering yourself more in the saddle, leg more under you, less in front, eyes up, energy and thought UP and FORWARD.