Aye. I suppose I forgot a more important criticism in that your anatomy is very... Flawed. You've got a few good things going but you need to do some muscle studies, figure drawings, and line simplification exercises so you can grasp it better.

Start with some art studies, find a photo of a dude showing as much sking as you're comfy with and draw that!

(And also remember that canonically Finn grows up to be a giant beefcake of a man)