I totally understand that it should be bright, but I don't think that's any reason for it to be washed out. For example, the bottom right of the sig where there is clearly a shadow behind the guy, it's still bright because the signature is just so washed out with light colors. I think some depth is definetly in order.

And about the jagged lines, I think they're awesome and you did a good job, but there's some that just look like maybe too much? Some in the top right and bottom left look a little scribbley.

Other than that though, awesome compo and lighting, great job overall.