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She's not blended very well, and the whole sig looks pretty low quality.
Yeah, the render wasn't perfect. But i've scaled it down a bit; hopefully that will help.
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but the lighting and depth is like... bad, so yeah, work on those two. It's completely flat, try burn/dodges and a little blurring too, and try to make light fall on her from that patch behind her, it'll help blending too.
I've done a bit of that; is it better noew? Or does it still need a bit more?
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You should have given her a more underwater look, with seaweed and stuff, and maybe added some bubbles to make her look more like she's underwater.
XD...She was meant to be flying...she is one of the witches from the Golden Compass...
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That said, it's one of your better ones, keep working and try checking out some tuts, or even downloading some .psds and .xcfs for ideas on new styles and effects.
Thank you, and yeah, this one and my Iorek one was a new style I was trying to develop a bit.
New and old for comparison.
Old:

New: