Yeah the renders are LQ and ur doing a shotty job with ur effects.
Try to set a scene for your render and make it blend in, look up zenron's guide to photoshop and read that up.
also at the rate you post these signatures, odds are your not putting enough thought or effort into making them. Try to focus on getting the basics right in one or two signatures rather than spamming up with 2 ones that might not've been your best

Quality> Quantity.