Optical Illusion Design

I had seen some of these designs before, but had only seem them done with male faces - So, I wanted to try one of my own. I'll be honest, I thought it would be a whole lot easier than it was, it was extremely difficult to get it looking anything a bit like the side profile of a face.. Although, I kind of got there… Sort of! It doesn't look like my side profile but I don't think it's supposed to.