 If you liked
Boku kara Kimi ga Kienai
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 ...then you might like
Ao Haru Ride
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Both have very nice art. As a shoujo manga lover myself I know you will like Ao Haru Ride just as much as you like Boku Kara.
They may have a different premise but both series involves with past connections that are connected to the present story. The main female character becomes the center of the story as she deals with both rivals and love interests. As the stories progresses, the main female character develops and matures more. At the same time, they face obstacles and experiences sorrow on various occasions. Artwork is fairly decent but among all things, expect romance. I recommend both series for anyone interested in shoujo with some common attributes.