What camera is that? For a 5.0 mp, those are very grainy. I use a 8.1 mp most of the time, but I cary a 3mp with me sometimes, and the pictures are of a much better quality at the size you linked up.
Mine is a Kodak DX4530 (2 years old), took the pics before I knew about the different modes you can take pics in (auto,sport,night,landscape,close-up). I took the ones of the Cobra in the "Auto" setting without making any adjustments to shutter speed etc.
I don't use a tripod so I dunno if that has anything to do with it, but Photobucket "resizes" any files over 1MB, and most of the ones of the Cobra were over 1MB.
Now I know they're not gonna be as good as your 8.1, but here are some full quality pics after I read the owners manual LOL! I didn't resize them (to keep as full quality as I could), so i'm sorry if you're screen is too small
What I really need is a tripod cuz I shake like little bitch
Close-up mode
Landscape mode
Landsape mode (this storm produces a tornado about 30 mins later)
Auto-mode
Close-up mode
Next 2 are on "auto" setting with 4sec time lapse(camera stationary)