you've definitely improved your compositions and such...I just suggest fixing the bubble and the text like the suggested, for example anti aliasing the bubble more or fixing up the text's AA.
Yeah it's very nice, loving the dithering and colours. But the text and speech bubble makes it look almost unfinished. I know it's not the main part of the piece, but i think it's a good idea to fiddle with it so it fits better and finishes it off nicely.
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Lol I didn't notice how old it was :P