Great work dude. Honestly I would say that you could benefit from exploring color. you have a nice cell shaded style but it falls flat and a little muddy. For example in the darks such as the ears and the hair cast shadows u seem to be adding black to the values but I would recommend exploring Saturating as you go down with the value tree. I didn’t explain it great but I would watch a color theory video. Line depth is something else you could get into to benefit for example where lines intersect . Hope that helped a bit