If I may suggest, I'd give more bulk to the calves muscles, and also increase the hooves size, perhaps by 30-50%, just to give it a try at least. It may give the figure a more "solid" stance overall.

For box-modelling the hands, there is basically two "schools" relating to how you shape the thumb-hand connection. Either starting from the palm, or from the side of it. In either case, you'll most certainly get some triangles, that depending on which way you'd choose to extrude the first thumb phalange, you'll have to "hide", or correct to quads, using either neighboring palm or wrist geometry.