Hey Paul! Looks pretty good for a Photoshop 'beginner'.
Some edges and shadows could be a bit better rendered and the tattoos are too opaque I think, but all in all its good!
I'm a total noob on Photoshop; I just bought my first graphics tablet this week. But I do have a fine art degree, so I'm not an amateur painter.
I agree with the details and it’s something I hope will sort itself out in time. I'm finding it hard to blend the colours I want (it’s all messed up compared to real paint) and there’s other niggling problems like layers and masking that I need to figure out.