Great work! I see you've started to figure out how PSP works
. In fact it's the Stop one that looks best on all colors (including black) in my opinion, perhaps except the lighter edge, although I personally don't mind at all. One problem with the stop button though, put it on a big white field and notice how, especially the upper right part, looks like it's been in the washing machine... if that's erased it might be better than the play button... I know I love it...
I attached a zoomed in version so you can clearly see it...