Looks nice although there could be room for improvement.
The black text in the friendslist I personally find hard to read, it doesn't seem crisp it's almost blurry both in the screenshot and when applied to steam.
Another thing is the empty space at the top, maybe add some detailing similar to what is shown in the following image below (In the spoiler)
I may give an attempt at a Steam skin myself sometime, nice work, Boat.