art background black blue branch design floral flourish flower flowers graphics green heart hi-res illustration love marriage pink plant romance romantic spring tree valentines vector wallpaper wedding day happy kiss kissing pair bloom gift give nature ornament red apple friendship fruit holiday man tast tender valentine valentine's woman bark cut feelings park trees boy couple girl hug human isolated parents people person shade shadow shape symbol together white amphibian bio ecology frog intimate leaf reptile sex silhouette toad underwater zoo