I like it - but its witty, not scary... I dont know if you wanted that. Yet its a creative and different take on the witch
If its witty that you want, then perhaps the purple iris should be visible on the let hand side too - it just looks a bit odd without the other iris showing imo.
But if its scary that you want - then maybe rethink the freckles as they look slightly cartoonish and amusing like that.
I love the way you made her hair become the billowing clouds, and the innocent expression on the little house is cute and witty.
My overall impression is that I like it a lot!...
Just my 2 cents.