Both are slice-of-life Korean manhwa that were originally webcomics with a reserved female protagonist and a slow, subtle romance. Great choices if you want a coming-of-age story with round, dynamic characters.
The art in both are simple but attractive. Annarasumanara has really beautiful imagery that uses color and 3D to emphasize certain things. The weird shape of some of the heads is not a mistake on the artist's part - it's symbolic of the character. Nineteen, Twenty-One, on the other hand, doesn't try to do anything too fancy with the art but is still very pleasant to look at with its colors. A welcome break from black and white manga.