1. 7 - It's way too messy. lol @ the background.
2. 9 - Everything's so good. But Nobita and (to a lesser extent) Doraemon look a bit off. Reminds me a bit of those Doraemon Specials manga with weird looking characters. Still so good though.
3. 8.5 - Great
4. 5.5 - Reminds me of magical girl animes of my childhood. The face is a bit...weird. And making more variations of the clouds' shape won't hurt.
5. 8 - Nice and clean. The wyvern's eye looks a bit weird but it's just me.
6. 6.5 - It's cute. The colouring could've been neater though.
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Oh, I am one yet many.