now now, lets dispense with the name calling.
i have yet to see an image that cant be improved in some way. to truly be a master and produce works that are unequalled and cant be improved on at all requires a lifetime of dedication. from what i gather you are still quite young.
and being open to critique goes a long way in becoming a better artist.
look at all the real pros, say on CGtalk, that post their stuff. THEY still get critiqued, THEY welcome critique because they know that thats the only way they can improve. im willing to bet that the only way they got where they are is with years of practise and thousands of brutal critiques that wouldve made other people quit trying.
where i am in school, thats what happens, when midterm or final critiques come up and youve got a couple months work on display, models and drawings into which your blood sweat and tears (sometimes literally) have gone, the panel gets its kicks by ripping the shit out of you and your work. the only way to get on and succeed is to take it in stride and take it for what it is: a way to help you get better at what youre doing. id much rather get torn up at a crit than everyone just nod their heads and say its alright because i know then that i will have learned something, i will know where and possibly how to improve. crits sometimes suck, but it does wonders for improving your skills.
and when it comes down to it, thats all that matters no?
so if i were you, id try to learn real fast how to deal with critique because when you get out in the real world and try to show your work (maybe for a living, if you so decide), people will be after you like starving dogs no matter how good you are.