Why my drawing looks bad? Need honest feedback.

I'm getting so sad because I feel I'm not improving. I'm trying my best to practice everyday and draw with the artstyle I have in mind. (I have a knack for anime style drawings.)

Im currently practicing cel shading but it turns out always bad for me. It doesn't suits my taste.

I'm losing the drive. I dont know if I should keep it up or just give it up.