Hi Pignut,
Dont beat yourself up, theyre nice shots, but if you wanted to work on your composition a little, I think someone has already mentioned that shot one is walking on stumps and thats gotta hurt! In the other two I think you would have felt better about them if youd dropped your camera height a little and tried to get on the same eye level with the subject, a great tip for photographing kids too. But primarily I think you need to do a little reading on composition if you dont feel its coming naturally to you, do a google search on the rule of thirds that should get you started.
I know its difficult with wild subjects, but it can be a valuable exercise to limit yourself to one shot per scene. It makes you look through the camera and assess the scene rather than just snapping away and hoping. You might decide to use your legs to get a different viewpoint or framing. Its also good practice to force yourself to look at each bit of the frame, its easy to get fixated on the main subject and not look at the elements of the picture.