It's nice to see ports of the good old classic Winamp 2 skins! I checked it out and I think you did a very decent job on this one, although I would perhaps suggest using a brighter color specifically for XMPlay highlighting the search results in the playlist (the Ctrl+F 'Select in list' feature).
I also think that in general, it would be nice to see a tutorial on how to convert Winamp 2 skins to XMPlay. This could bring many gems from the Winamp Classic era to XMPlay and thus give them a new life. Someone with coding skills could even write a converter based on this methodology. Though due to several differences between the two players (like the aforementioned search results highlighting) some colors/elements might need to be specified/supplied by the user....