>>2555First off, there's way, way more unappealing artwork than what we're seeing right now, so don't knock yourself down too bad. The drawing itself is, indeed, amateurish, but the only way you can develop more skills is by practicing so I can't say much on how you can exactly get "better"
Now, as for your original question as to the drawing itself, I think the mask looks like your trying to hide from actually drawing the face. Not only that but the mask itself is just blank. Maybe add some detail that'll give some dimension or texture to the mask he's wearing (vents, fabric folds, cloth pattern, etc)
My best advice is try drawing a full plain face and adding features and details. Maybe look up reference photos and see how you can make the mask more form fitted to the character's face.
Other than that idk, maybe back up a bit so we can see more of the character or work more on the hair to make it look less scribbled in
pro tip: fill in with a dark purple, THEN scribble hair lines over with a lighter colour. But it's all up to you fam, keep at the good work and don't knock yourself down cuz it's a good start.