Ooh, ice is a hard subject to paint...you seem to be doing well tho
I think the second image is too blue/cyan...i prefer more white in it....the buildings look kinda cartoony...unless that's the style you were going for...try this tutorial, it's all about ice and might help you:
http://www.imaginefx.com/02287754332958438189/custom-brushes-4-elements.html
*There is always room for improvement*