First of all I have to thank you very much for this theme! I always loved musicbee but I liked how wmp looked much more, and now I can't even say it anymore and musicbee is the best of the best
Anyway, I think the background of the artwork view should be light blue like the others view and not gray, which is a bit out of style with the rest of the skin. Also, I noticed that the play/pause button should bigger than the previous/next buttons, while is almost smaller, and that maybe the red of the lastfm icon is too outstanding and perharps it would look better if there was only the symbol of lastfm and not the whole square. In the end maybe the autodj icon should be smaller to fit best. They're only suggestions though
Thank you for your hard work!