I don't like the outer glow - it's very noobish. In addition, the color tones don't seem to match up. You have dark text on a muted background - which would work, were it not for the bullet. If you added a filter to the bullet/color overlay, or something to make it less deviant from the over-all schema, it would look a great deal better.
Now for the text: Can't say I like the style nor the wording. What part of this implies a bullet to one's head, figuratively or literally? I see a fist jutting up out of the background - something reminiscent of protest or victory, which works well with the grunge where the text doesn't. It looks like you used a variation of Courier to get the job done - it looks
all right, but if you're going to do grunge, do it all the way. Use a grungy font - Courier is primarily regarded as a techy font, being monospace and all that.
And the background: It's pretty good, I think, except for that whitish line jutting to the right of the fist. It seems almost out of place. I see you had fun with random brushes - try not to use too many of them. Try to stay within your theme or it'll start to look really messy. Again, the bullet doesn't seem to fit. Its current position in the middle of the text makes the text a little hard to read. Ideally, the bullet would be somewhere more prominent so people would see how the background correlated to the text it's accenting - since that's essentially what an image signature is.
Notes: Migue was right about it being a little too short, but it really all depends on how big your website's layout is going to be. For the moment, stay with the style you've chosen.
In conclusion, I'll probably give you a 5/10 - good work, keep it up, and sorry for the commentary!
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