a painting of an ocean scene with a mountain in the background, fantasy sea landscape, by RHADS, ocean background setting, fantasy matte painting，cute, underwater landscape, ornate sea background, under water scenery, sea background, ocean background, underwater environment, underwater scenery, beautiful oil matte painting, underwater scene, matte painting”, matte painting ”, realistic ocean, 4k hd,, beautiful art uhd 4 k, a beautiful artwork illustration, beautiful digital painting, highly detailed digital painting, beautiful digital artwork, detailed painting 4 k, very detailed digital painting, rich picturesque colors, gorgeous digital painting