I love the cat looking upward! just love it.
As for the horses, your ones in movement are much more appealing. your understanding of the movement footfall and skeletal structure, as to how it bears weight and all, is pretty darn good. There's always room for improvement, so just keep looking back at your old stuff, comparing to new, and to photos of real hroses to see if you have been missing something.
For example, the last piece has really good hindquarters, but the front leg is kind of chunky and stiff, and the chest is not quite as large as it should be. Maybe it's that the front "flying" leg it coming out of the body a wee bit too much, as if the elbow is a bit unjointed.
But, in reality, none of that really matters if you have energy in the drawing. you can exaggerate all you want, if it has spunk and flow and makes the viewer feel like it's jsut going to run right off the page.
Go faster! Draw a lot faster for a bit so you wont' get stuck in details. Get a softer pencil, like a 3B or a 5B and some cheap paper , and go FAST!