Sig of this great singer and guitarist.

Make some comments, please .

the bg and the render doesn't fit very well mate.. i'd say for the render work, choose a smooth and toned down bg instead
color are too saturated, work on the contrasts and lighting and try to add some variation..
text is ok but get rid of the motion blur on it, and the splatter clipping mask and the two bright textures you have used around the render don't really work well.
render itself is nice
just keep working mate and you'll improve!

the colors are too high here
try to make your colors fit well
text could be better
try to keep it near your render
and choose a better font
your effects in text could be improved too
lighting needs improvement
you should always give highlights for your render
here you leave all the sign at the same level
render effects looks lq
try to improve a bit more your render effects
keep praticing
stay active