lol its really not bad for early work..ive seen way worse..hell ive prolly made way worse when i started..im not ashamed to admit it kuz everyone starts somewhere..so keep at it man...if u used gimp im not familiar with it..but i know my way around photoshop pretty well..if that's what u used then try messing around with random tools in the toolbar or the filters at the top
check this site out if u want
www.pixel2life.com i never really used tutorials much i learned by experimenting mostly...tho i did from time to time scan through one for a trick here or a idea there etc..but yea that site covers alot of things from flash to ps to gimp and all that