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this is a beautiful piece!
the spot-on likeness of Heath Ledger is perfect, as well as his expression. The splattered colors give the impression of the Joker's chaotic nature as well as giving the viewer a lot to look at with a great use of space and color.
the red lettering placed in front of the Joker and the black lettering behind him give a great sense of movement without taking away from the focal point (the Joker himself).
The shading used is well done, without being under- or over- utilized, giving the picture great depth without the use of a background.
Overall, a great work!