I'm just getting started myself so take my criticism with a grain of salt. I think your drawings look good and you're on the right track! That second photo especially does a great job of conveying motion. In the last photo you uploaded, it looks like your proportions are not balanced right which is taking away from the image. The body on the left has such a big torso and head, and the legs look much too small in comparison. I can tell there's some foreshortening happening in the image, so naturally, it does have to look "smaller", but I think you can foreshorten it without losing the balance. (But nice job on the foreshortening of that front leg!) How can you avoid losing that balance? Since I'm a beginner, I can only guess that this balance of the image happens from further observations of the size relationships between various body parts, and from practice. Maybe making the upper body a touch smaller in comparison to the legs, or maybe making the head smaller. Look at the size of the head compared to the shin area in that image I was talking about, and compare how they relate to one another. Again, I think all your uploads look awesome for someone that is just starting! Keep going! :)