The render looks like it is just slapped on, meaning you could take out the kid cudi render and replace it with anything.
There should be more blending in the sig that allows the render to fit the rest of it well instead of there being random brushstrokes in the background and kid cudi placed on top

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The text placement could be better, maybe not so far down toward the bottom.
The lighting is alright, but it looks like there are two light sources, one on the top right and one in the top left.
Keep at it, just keep bustin em out and you will gain experience

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