Hiya Kuldotha, welcome to the Guild! Mountains are the constant difficulty for many, if not most of us, so don't feel alone in your mountain struggles

I'd agree with Ascension that all they really need is some matching brown - in fact, you've already got a good start on the coloring there, I'd just make it a more brown and a little darker. As far as the scale goes, it doesn't look like too big of an area to me, but I'm not sure exactly what scale (i.e. miles to pixels/inches) you've got in mind. Slap a scalebar on there and we can give you some better opinions on that.

All in all, it looks great for a first map, have some rep for putting a map in your first post!