I use photobucket

1 looks best too me (heads not crushed, I've got a major problem when something is distorted or pixelized, it drives me nuts! though I don't mind blurriness, but prefer it to be clear.)

I agree with Joomla, it NEEDS a border, it just looks that way...

3 could be good if the shadow ended sooner, it's touching her face which is bothering me...

Bellow was my first sig (I just started joining the community here not that long ago, and don't really use my accounts on other forums so I've never made a sig) I like spent a good hour putting it together, using Word, Photoshop, and gimp. :3

Love how Santa's got loli in his bag this year :D