Render looks stretched or LQ idk .. bad render choice too much white space without having enough WOW factor in the middle Text is lame and plain i like your current signature , the skateboard. why do you use the same text and text effect for all the sigs?
image looks stretched like commented above learn how to resize images not to mention the bg looks to plain
Effects are meh, and seem to end abruptly. Render is stretched or squished. Try using different text for your signatures. It works on your skate signature, but that is about it. Colors are very desaturated in places, make the effects seem dull and lifeless. White background is really white and plain, could use a bit of texture and color.