Ya I would say work on those hills more. Such a scene is probibly not possible in the real world and that is why it looks the way it does. If you had hard rocky without plants type mountains meaning very little soil there will not be a bog at the bottom of them. I would smooth them out a bit and use a different texture that implys more growth on them. Something that would match a bog theme. If you do not smooth then out a bit then the only way it would work is move them farther in the distance so they don't look like there so close to the camera. I live in the mountains. They're never that perfect in a view. They bleed to the sky color cause of there scale.