As you can see here, the NoArtwork is working, but not the UnknownArtist.
But to be sure, the UnknownArtist should replace the grey man in the middle right?
Is it supposed to be replaced if the artist in the tag is unknown and if no artist is in the tag, or only if tag info unknown? (I tested both but no result, just to be sure if someone knows this precision).
In the Sample skin I could see it is colored (but did not manage to retreive the color from the color picker...), so my guess is that the base image is using another skin color as reference to apply too (with some "effect that changes the end result color? No idea, but not the main issue
).
I did find this though: ' <!-- UnknownArtist 135x135 -->'
So I tried with this resolution but still no luck.
So, I only managed to get the NoArtwork to work, but not the UnknownArtist, so, I clearly don't see what's wrong if one works but not the other...