Sea Turtle close-up

I had such fun at my workshop yesterday. I finished my sea turtle painting with over two hours to go, but had forgotten to bring a second canvas. My friend Kay, though, graciously gave me an extra 8x8 small square canvas that she had and it seemed perfect for a close-up portrait.

Of course I didn't realize how hard it would be when:
1) I was working from a very small reference photo without strong facial details.
2) I've never painted a sea turtle before so have no clear mental image of what they should look like.

So this was actually a bit of the struggle. As the instructor said "He looks a bit like an alien". But it was really more the water I cared about than the turtle anyway, so it was still fun.