Happy new tablet! I found the tablet a little odd at the start, but once I got used to it, I couldn't imagine doing without it. I think you'll find your mountains and forests are soooo much easier to create with a tablet.

I'm interested to hear how get on with Krita. I've had it on my system for a while, and every now and then I open it and have a poke around. I usually end up going back to Gimp though, simply because I know it better and it's faster for me, but I really want to dedicate the time to learning Krita properly.