I also don't now about the rules,but you should have posted Hazard first.Mr.cricket Avatars with out text are good."Warlord" said that it's against the rules. I don't know...
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Mike Hussey avatars 4 versions.
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My best sig so far.
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You look much improved when it comes to icons.Text is where you struggle,try not to add a text in icons.Use simple and clear fonts.
Some good fonts:Arial,Gotham,Rage italic,Levi Brush,Impact,and many more are there try Dafont.
You are doing a decent job in blending the textures,try to use a render than a stock for signatures.
For effects,try not to overdo them and play well with all the options available.
Good luck.