Wow, very good level for first drawings in pixel art! At any level of skill there will be shortcomings, so you can improve endlessly. This is normal. The main thing is to try and each time it will get better and better. I hope you do not give up drawing if it interests you. Good luck, you have a good base! :DD
(heh thank you very much for such a nice comment :3 I am far from perfect in drawing now. and you can see my progress in drawing in different games)