It's beautiful! I really like the the style, he colors, her dress and expression, everything! Very wistful and evocative. Lovely work! I saw someone inquired about a bigger version, was that ever arranged?
This is one of my favorite "Rapunzel" pieces on Deviantart. I not only love the hair, but the background... and her expression is one of the things that make this one stand out. Is she thinking of letting herself fall off the edge? Being stuck up there for almost her entire life, you probably couldn't blame her if she lost her mind at some point.