if you want to learn how to make your computer art better, there are hundreds of drawing tutorials over on deviantart which can help you. Here are the ones that helped me the most:
http://grypwolf.deviantart.com/art/How-I-make-my-Lineart-326012466 (http://grypwolf.deviantart.com/art/How-I-make-my-Lineart-326012466)
http://grypwolf.deviantart.com/art/Stone-Tutorial-209083572 (http://grypwolf.deviantart.com/art/Stone-Tutorial-209083572)
http://grypwolf.deviantart.com/art/Shading-tutorial-174197817 (http://grypwolf.deviantart.com/art/Shading-tutorial-174197817)
http://tamberella.deviantart.com/art/Giant-Shading-Tutorial-251104611 (http://tamberella.deviantart.com/art/Giant-Shading-Tutorial-251104611)
http://tamberella.deviantart.com/art/A-Fur-Tutorial-Part-1-213293289 (http://tamberella.deviantart.com/art/A-Fur-Tutorial-Part-1-213293289)
I do believe you should've made a separate thread for this question, but;
try uploading it to a site like tinypic or imgur. There's always the option of DeviantArt stash, a little area to DeviantArt to where you can post your art privately and that no one can really view without a link.
Okay, to get this straight, I don't have a DeviantArt account, AND I will probably not get one because of personal reasons , remember that! AND I also won't get any accounts for other web sites. I don't trust them and stuff can happen, I also don't care if you or somebody else trusts it.
So then what do I do if I can't use any website to post my pictures on, or anything that has a web address URL, whatever, just on plain computer documents? (On the signature not on the side!!)
You cannot upload, for lack of a better term, a file directly to this site to place into your signature without linking it from another site, I believe. You cannot grab the file's directory from your local computer either, since it hasn't been "shared," and no other computers have access to it.