This isnt a problem with your sigs, but heres some advice on what to do in the future if you run into any problems^^
When re sizing, if the image looks a little blurry, try using the Sharpen tool of you have one. It makes the quality of the render a little better, and a lot less blurry^^
(I don't think you'll need this one, just in case you really do open a shop)
If you open a sig shop, make sure you do exactly what the customer tells you to do owo try to avoid making up your own style in the sig and go like "eh, it'll do".
Signatures will not exceed a height of 200 pixels, a width of 700 pixels and a file size of 120 Kb.
Avatars must be no more than 200x200 pixels and no more than 60kb in file size
Let the background and effects flow with the render~
and that's all :> I hope those will help. I have a few others, but I can't quite remember. If you need help with anything when you run into any problems, feel free to ask meh owo