Lovely work - as a crit - if you want to keep working on this have the characters hair blowing as the clouds behind are moving - and then with the red - if you have that glowing, expanding and creeping like an octopus would It would loook REALLY AMAZING
Right now you have all the elements you need to work with and they look stunning!
Faaaaaaaaaah this is wicked!! Seen it a few times and every time it gets me! The colours, those tentacles!! and especially that angle, staged for some kinda epic battle or something XDXD Somebody's about to open a can of whoop-ass