A little too bright to the left. The rest is nice, cool text, and nice effect to the right of him too.
Lets see, this one could have a better flow. As mentioned, it is a lil too bright at the left, burn that down. The b/w version looks way more interesting than the colored one, I do not really like that compo, it does not really fit with the render. ;(
Too much yellow on the left. Nice text. Maybe replace the excess yellow with some effects on his left.
add an exposure layer, mess with the middle setting (not too much), it should give a nice "washed out" effect, it should reduce your colour problems and make your sig look a lot better