blue brushwood fog forest nature silouette sunrise sunset trees underbrush vector conifer England english flowers Great Britain natural pine rhodedendron rhododendron shrubs spring Surrey woodland exercise path shadow sunlight Sussex track walk winter canada conifers lake landscape mountain peak Rockies Rocky Mountains shore snow summit Betula birch deciduous trunks white current flow green river summer view water fall mountains rocks scenics tree brown ground mount sky Fir game mouflon national reserve nobody ram sheep spruce untouched wildlife