No problem, itīs really good, I also try things like this from time to time and I have a lot of troubles. As soon as I start to paint over the outlines so that they are invisible, I loose my orientation xD But this is wonderful.
See, I don't paint over the lines, I just make the layer invisible to visible when I need so. I alwayyys use references for stuff like this, and you're so talented, I'm sure you have the capacity to do portraits. Thanks so much, though!