Keeping the quality on a photo when converted to .jpg from .

[Bernard]

Okay, so I have GIMP2.6 and I'm using it right now to draw some things for my shop. When I'm finished I save the picture as _____.xcf. Then, after that I convert it to _____.jpg or _____.jpeg I go to Photobucket to upload the photo then I look at it full screen and it ends up losing the sharpness/quality it had before. This also happens when I open the picture on Microsoft Paint. I keep getting irritated because my pictures aren't coming out right. Can someone please help me? The bad quality makes the picture lose its...appeal. ):
Oh, okay. I got it. Thanks PFCAnde. :3