Well, I like the pink and blue on the free edge, not too sure about the yellow. I think they would have looked nicer if the smile was smilier, more consistent and further towards the free edge to elongate the nail bed. That said I haven't used coloured powders, only glitter powders so I don't know if they are workable for less time? I agree with everyone who mentioned the sidewalls too. The best nail for me is the index finger, for the design, on the top hand, I like the blue swirling up onto the nail bed, its nice and crisp.
Thanks for sharing, I've long been tempted to try coloured powders, what differences, if any, did you find between them and the usual whites and pinks?