The Horta was a highly intelligent, but extremely territorial and protective creature. Its concept of beauty was based on the natural beauty of its home environment, the crystal formations of its cave.
The Horta viewed humans as intruders and threats to its existence. It was only after Spock helped the Horta understand the miners' need for resources, and the miners understood the Horta's need to protect its young, that the two species could co-exist.
So, to answer your question directly, the Horta didn't find any human features appealing, as it considered them a threat.