This is a nice idea, but for some reason I think the rays and the horse/sigh/fence in the background really take away from the feel of it. A bit of contrast would be nice as well, to really help it pop out for the viewer.
Basking in the sun is a great concept and I like your capture, however the tones are too muted and nothing really grabs me. I wish there was more contrast. The background distracts from the main idea. The facial expression is perfect! ...like drinking the sunlight.