This is adorable. I really like how you made both the woman and the horse look happy, also flowy hair on both makes it interesting. But I really like how the colors fit nicely and the bright gold of her hair piece matches the horse. Betting that's why she chose it.
Also, the first thing I noticed was your signature and how nicely it fit
You do like it? Good. I changed it, since writing out the whole website name wasn't working for my wrists. I can tire them up somewhat easily - especially if I'm inking something as complicated as hair. I would rather spend my efforts on that than writing out "tumblr.com"... :]
The gold decoration should echo a hoof shape - I was thinking she would be more Rohan-cultured if she had horse motifs on her.