In many maps with outdoor places there are backgrounds of huge mountains, but when I just put a couple of mountains it doesn't look very good. How to make a realistic background?
Check out some decompiled Valve maps and see how they do it. Often they use a bit of displacements with foliage props sprinkled on top, followed up with tree skycard props.
If this is your first time logging in after the migration (Feb 8, 2022), you must reset your password to log in. Follow this guide if you're having trouble