-The stacks are pretty cool. You could subtly redraw the ghosts for the highlighted states to give them a bit more animation. In other words, they would wobble a tiny bit, and their expressions would change slightly, when you moved the mouse up and down them - and on the SEL stack, the jaws would open wider.
-When I said that the shuffle/repeat get lost in the detail, it of course had nothing to do with not being able to find them
. However, they are fiddly to use, and aesthetically speaking, they don't seem to be as prominent as they should be in the overall layout. I'd simply suggest making them both bigger if that's doable.
-Having no balance slider is no major crime, but it seems like this is one of those rare picture skins that could accomodate a balance slider with very little fuss.
-the lightning bolt is getting a bit lost. Maybe just make it brighter (but don't brighten the wooden stick that it's attached to) so it stands out a little more.
-what's the deal with not having background colours for selected items in the playlist and ML?