pale colorful handdrawing spirals nature aesthetic tree branches, nature core backrounds

line drawing branch sketch yellow tree art design plant pale rainbow nature aesthetic branches pnature colorful handdrawing spirals core round backround backrounds creative artsy hand mixed technique background trees multicolor multi color backgrounds botanicals abstract media composition artistic grainy gradient botanic leaves original botanical biology colors landscape scenery forest plants forests paint painting arty artful crafty craft abstraction scene grain birch effect pink green background backgrounds composition naturecore green academia