Due to the fact that I'm not a specialist in creating signatures I just can give you my overall impression and the resulting tips what to improve:
I think you should focus more on the text. I personally don't like the text in any image at all. Sometimes it's misplaced, to big, to small etc. You should work more on integrating the text into the image
I think my personal favourite is the purple-blue woman (tonto in left lower corner) because there you managed best to create one fluent, vibrant image (foreground + background)
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