You've got some creative stuff here.
It's just a shame that you're a GIMP user, but one gets used to it eventually.
Overallish, I think your gfx are ok. Like I just said and I feel like pointing it out, you're creative on your stuff (e.g. the picture of your fic), and there's so much more that you could achieve faster and easier by going into photoshop... Yea I know, you're gonna say there's no money to buy it, well it's a shame since it would give you much more possibilities.
Now to rate your gfx: They are indeed creative (xD). I specially like the stuff you did for your fic, but the signatures are also ok, though you should improve. I firmly believe that you should start and get some sense of flow. By saying this, I mean that you should add depth to your signatures, not only placing the elements and let them look like they're floating. You must attach them all together, blend them.
I don't know much about GIMP, but if there is a good paintbrush tool in which you can import paintbrushes, do consider using it. Brush your background, and then blend the elements on it. It'll work pretty well, specially if it's the first time you're using it (then you'll start getting perfectionist and spend hours just making one detail x)).
Keep it up and coming =)
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