Hi ghilo! You chose a couple of difficult poses! May I suggest you try using less cylindrical or otherwise curved shapes and try using some boxes and wedges, for example for the shoulders and pelvis? They will make your life a lot easier in determining the pose and the space occupied by the figure. I would also advise you to always start with a gesture, as you would when drawing a figure. The legs, especially of animals such as deer and cows, are often, from the elbow/knee down, just bones and tendons with a minimal amount of muscle and fat, so not very cylindrical. When you draw the head try to imagine first of all the shape of the skull: you will have an arch of the eyebrow, the cheek bones, the arch of the nose, the jaw: none of these shapes is usually curved, but made of planes and the only big "soft" mass is given by the muscles of the jaw (as in horses that have a big curved muscle which is their characteristic). Don't be a slave to shapes, before you start drawing try to understand what is really a curve and what is a flat superdice. Animals and people ultimately have roughly the same structure, just with different proportions and joint configurations :)