I understand that Alice is in wonderland and it has a sort of dream like quality but I feel that the excessive amount of soft edges is distracting. Also the black bands on the cat don't seem to really be highlighted and it detracts from the picture as a whole.
I really like the sharpness of his face though, although the eyelids kind of confuse me as they look straight while the brows and eyes themselves aren't.
Alice's forearms also seem a bit too long.
It's a good concept though, I think it's always suited the cheshire cat to leer at Alice from a higher elevation to prove how far removed he is from her. Being mad and all.
I think the cropping on Alice is hiding something we might want to see. How is she holding her feet, is she nervous or excited?
There's not really a lot of silhouette going on with the cat. Right now, he's just sort of a giant purple and black blob with a head. There aren't a lot of cues that he's actually doing anything beyond just standing there leering, which really doesn't add much drama.
For Alice, she doesn't seem nervous or excited at all. Her body language seems passive and unsurprised, she's not reacting to anything (we move towards what we're fascinated with, away from what we're repulsed by) but just standing there looking in the way that I'd look at a somewhat ordinary tree.
So my suggestion is more silhouette on the cat, more gesture and acting on Alice, and maybe pulling the horizon line down a bit to bring the image more into Alice's point of view.
The Nezumi Works Sketchbook - Now in progress
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"Skill is the result of trying again and again, applying our ability and proving our knowledge as we gain it. Let us get used to throwing away the unsuccessful effort and doing the job over. Let us consider obstacles as something to be expected in any endeavor; then they won't seem quite so insurmountable or so defeating." - Andrew Loomis
it wants sharpening up a bit.