Im not an artistic genius and I no longer practice this style of tagging but I can tell you this, if you are serious about gfx I suggest taking your work to a gfx forum I am a member of.Not trying to be a dick but the majority of people on this forum half the time dont know what they are talking about when they critique tags, they just bullshit for a valid post. Anyways if you want the site just PM me ill send you the link
/rant

Regarding the colors, I guess the main problem is that the bg isn't really white but off white which looks pretty weird compared to the rest of the tag. If you are planning to make a tag with multiple focal points try your best to make all of them clear and "lead" the viewer's eyes because my eyes are wondering all over this piece and its only 280x400.