PNG Help?

Hi! I'm Lizlet from the Alexina server. I'm having trouble making a png that looks flawless like Zugon. My pngs seems to be a little grainy and I would like to know the method of making it better if possible (I print screen and sometimes screenshot). I read the guide, but I didn't really understand how to capture the best.

Example: http://wiki.mabinogiworld.com/view/Rolling_Pin/Images (Compare Zugon to mines, which is the green to white)

http://wiki.mabinogiworld.com/view/User:LexisMikaya/Optimizing_Pictures_to_Wiki_Standards#Taking_Pictures_of_Headgears

.3. Read this.

Read: User:LexisMikaya/Optimizing Pictures to Wiki Standards

How I do it:

1. Focus the camera on the object being taken
2. Open snipping tool
3. Using rectangular snip, drag the cursor over the object
4. Save object with .png at the end of the file name
5. Edit the photo with whatever program that doesn't affect the image's quality
6. Upload to wiki

Dammit Sakura derank your Ninja Mastery D:

Okay, I read someone else's guide. That one helps A LOT. Thanks you two :P