^ Not technically a "signature". You have to do something to the image for it to count as a signature.
This section is for art, not screenshots. Try experimenting with photoshop (if you haven't) or gimp for a free LEGAL alternative. Look up tutorials, and you will be making sigs in no time.
Before ripping on other member's attempts, I think it would be advised for you to post some of your own work - otherwise at the moment, I don't think anyone will respect your opinion, nor your judgment. Also, telling someone to 'read up on some tutorials' is not critical feedback.