It does look very nice with a darker background... I still don't understand why PJ makes it able for you to choose your own colour for the window where your canvas is put in... It would make a big difference, Some pieces are to be shown with a specific background colour, and to make a huge canvas for a small piece would be rather stupid...
But going back to the piece... I think the breasts are a bit oversized, and maybe less/no dithering could have made is less rough, but as surt said a very nice concept
I dig it. Neat concept and good use of so deliciously few colours.
A little rough in places, particularly the edges of the arms, but I think it works -- against this dark theme background at least.
Head could do with some clarification perhaps, Not sure if that's a lobe of hair or a puppy-dog ear, and the brow looks too heavy considering the otherwise feminine nature of the form.
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But going back to the piece... I think the breasts are a bit oversized, and maybe less/no dithering could have made is less rough, but as surt said a very nice concept