Cute concept :) The lighting is definitely too strong though, as there is no visible source for the light coming from her left. Using soft shadows will help with that, too. Also I notice she doesn't seem to be looking directly at the mouse, more above it. Or rather, her left eye is, but her right eye isn't - unless that's caused by shadows thrown by the hair, in which case you might want to morph it slightly to avoid this. Nice one!

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire