Unfortunately I can not help you there because I dont use this program. I am sure you will grow in skill, its almost impossible to avoid this when drawing even just semi-regulary. The key is to never be satisfied and always comparing with those who are better. But in a motivating way that makes you think " i can be like this in X time too if i work hard" not in a self pitty destructive way ofc.

If i may give you a hint to speed up your progress: Do your Studies! Draw that stupid Vegetable from Bumpskees Tread, draw those anatomy studies from loomis or Hogarth or whoever. It will help you so much. I am kind of hypocrite here because I tend to neglect this stuff myself. And it shows so much. I feel those gaping holes of skill every time I try to push an Image. Can't recommend it enough.