A horizontal crop of the mountains and a bit of the trees would be great
Anyway, that would completely change the picture. What you need is a Grad. ND filter (like the Cokin P121) to make the sky darker, because right now the trees are underexposed. In this particular picture, there is also a decent amount of blue sky. Or what you can do is get a polarizing filter (like the Hoya PL-CIR). It will darken blue skies, adding contrast to the sky and make clouds really pop.
Shooting at f/7ish to f/13ish will usually yield the best quality for pictures like this one. The Pentax kit does not perform the greatest at f/32 (assuming you were using the kit lens?)
Keep shooting!
