I think it's a pretty good start, particularly since I have no luck whatever on faces. The nose looks a bit too wide? I can't help you with Shi-Painter.. don't know how to use that.

I couldn't say Bunny without a ref to look at. There are better people here who are experts at realism portraits so I have no right to say. I do have to say though, and this is eerie, it looks a little like me <8O