Fuzzy

It was mentioned to me on another forum that my sigs were 'fuzzy'

I'm guessing thats a resolution issue, and jpeg conversion issue??

The forum has a 20 k limit, so here's a few sigs I've done that are noted as fuzzy.

http://img.photobucket.com/albums/v4...5/DunnSig1.jpg
http://img.photobucket.com/albums/v4...5/RedsSig1.jpg

and the latest one.
http://www.imghst.com/uploads/redsfan75/Claussen.jpg

Here's one over the limit.
http://img.photobucket.com/albums/v4...sFan75/BRM.png

Help!

I want them to be clear but in Photoshop I save for web and reduce it to around 75 %

What else can I do to reduce this effect?

Thanks for the help.