I won't really be putting critics on this because it's actually nice to be honest and the colors are fitting very well.
I don't really think that it's blurry because it's looking fine for me but you know what they say: Everyone's opinion is different.
Maybe your able to make me one and if you are going to then i would want to have the top one with my name on it so i can set it as my Windows background ;D
Good luck with further making backgrounds.
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You may just use my Devbest name which is: Newfag in this case but you may also just use my older forum name which is Mastah - You decide.
I'm looking forward on getting the background already!
I really dislike the mix of color you use, I don't think a dark blue (purpleish) looks good with yellow at all. Also your gradients are too strong, try to make them a bit more solid. Nice try though.
I really dislike the colors, they don't mix well. The gradients... I don't know if the gradient is too strong like Alam said... but I'd just get rid of it and do flat.