illustrated serene landscape with river, trees, and rocks. nature art perfect for projects, posters, and backgrounds

landscape river tree rock nature art design project poster picturesque serene outdoor foliage lover aesthetic attractive countryside quietness woodland forest graphic wilderness majestic plant mountain water decoration visual botany artistic beauty wallpaper background perfect remote untouched idyllic tranquil scenic scenery peaceful earth greenery craft element solitude adventure meadow illustrated trees rocks projects posters backgrounds generative