/ic/ - Artwork/Critique

Posted this in the last thread but I've worked on it a bit more.

I don't own a tablet so I have to do all of my painting in PS with a mouse so please excuse the lines being a bit wobbly, I'm still cleaning them up.

This is a present for my degenerate boyfriend who really digs his domineering futa succubi. I've never drawn anything pornographic in my life which has also lead to the realisation that I actually don't really know how to draw cock and balls so tips/advice/corrections/red lines would be super appreciated.
Also my lighting is like.... help.

btw I'll be blending all of the shading together once I've finished applying it.

Also she is going to be sitting on a guys face.

I-I hope he likes it.