Didn't saw that anime but always liked that blue-haired girl when I saw her on scans.
Well, I think that with this wall, your vectoring reached more advanced level, I can't really see any mistakes
^^
But you could have put more afford in bg... I meen, it looks good seeing as it took an hour, but you didn't have to
rush. I already saw as some people had trouble with making nice walls because of rushing to finish it. You don't really
have that problem as your walls already are on high level, but if you would put more effort in parts like bg, it could
get even better ^^
On original scan clouds are "touching" water which somehow creates better feeling... can't really explain it
but it looks better that way. Also, you could have made some parts of water more highlighted because it looks a bit
plain.
But don't worry, it's still a good improvement! ^^