thanks manu, nice edit

I like it, original take!

Some banding on the jaw and back outline; not convinced about the lower right spikes AA options.

Edit here. I emphasized the contrast between the fluid face outline and the other elements geometric harshness which I think is the strong point in this composition; tried a different spike option; then chose a darker intermediate color in the upper right quadrant (helps with AA and catches the viewer's eye).

 oh crap, didnt even realise. thanks

You actually have 3 colours in the top left, if you remove the dithering in the corner it should be fine.