It Doesn't look like a Senegal to me. It appears to be a graceful with that little scooped casque. My girl has never shown pattern like that either. Just some input hope it helps. I'd say graceful though for sure.
That black pattern does indicate that he is stressed by something. I'm assuming he is a new? Chameleons in general are shy and nervous so if he is a new pet he is probably a little scared. This is normal. Once he figures out that you are not going to eat him he will calm down. I recommend not handling or interacting with him for the first few weeks. Let him watch you and learn your habits and he will start to feel more safe.