The artist thinks that weight won't be an issue for a horse girl. Knowing what they pull on a regular basis, I happen to agree with that sentiment.
The issue I'm bringing up is how she's holding the camera with a large telephoto lens. The camera and lens are two separate components and the large telephoto lens can be especially heavy. The weight of the lens being supported by the camera alone risks damaging the camera. She should be directly holding the lens to support its weight.