/ic/ - Artwork/Critique

Posted this in the last thread but I deleted it to work on it a bit more (definitely still need to work on the swim trunks, I totally fucked those up).

I've been trying to draw digitally again and while I'm digging the switch from Sai to Photoshop I'm still having trouble with cleaning up my linework. Is this more of a matter of being patient and practicing with the tablet or am I doing something wrong?

I also couldn't find a way to lighten my original layer's opacity, I could only find the jigger for the brushes.