bank cloud gray Great Britain green grey hill landscape lane nature road rural storm travel trees wales welsh woodland conifers countryside fence fields hedge hills Powys slope track view winter Downs England field gate grass sky south spring Sussex turf copse green valley landscapes meadow panorama pasture peace peaceful sheep South Downs summer tranquil tree valley bale crop farm harvest hay haybale hayroll HDR Nyberg roll scenery straw wheat haybale wheat english environment natural pond water clouds corn plants snow stubble sun sunset