air animal animals bird birds blue clouds flock flying freedom gliding gull high seagull seagulls sky wing wings beach beak family feathers feet five fly gathering group gulls isolated sea water waterfowl feather nature coast coastal England eye foot Great Britain herring gull kent Larus argentatus shore flow leg mono one river shallow blue background clear sky flight fresh kelp gull Larus pacific gull peaceful relax stress-free summer sunny wing span ba1969 illustration painting watercolor coastline green rock white