(i cant take banner crit but aparently i sure can give it)
I like the concept of the first one, its very cute and the series is cool too..
the concept of the second one is okay, but not that interesting to me, and it helps to know the series behind the picture...
the third one is cute but you misspelled "else" (someone already mentioned) and thats more than likely the reason it was rejected... (i used to get rejected banners for misspellings all the time, its made me learn to double check it most of the time)
i voted them unworthy mostly because i didnt like the quality of the logo
it has like a rainbowing effect around the edges, and it seems kinda jaggedy and not smooth...
other things that added into it:
1. the text seemed very flat and blended kinda with the background...
2. the images though cute are very very very small, and hard to see it helps if your image takes up more than just the tiny corner of the banner
3. "animemusicvideos.org" is kinda hard to make out
4. banner #2 i dont like the color scheme... pale pink would go better with that color green than red would
5. the backgrounds are uninteresting flat color
I think ive also heard a complaint about people overusing "little girl" anime pics for banners
another thing you might want to do is take a look at
what kind of banners are winning and the types of banners
the top banner makers have made.. I'm not saying to coppy their styles but its worth looking at what is winning votes and compare to what isnt so you can get an idea on how you can improve your own style if you want to win some worthy banners