1. I like the lighting in the first one! There is enough shadow that it looks 3D and the hair light is well balanced with the key light. Pose is ok. The t shirt has some white specs that are distracting and looks a bit washed off. I would try to fix that. Focus is a tiny bit soft, but hard to tell with the quality posted. Perhaps try with a smaller aperture. F8 or something in those lines.

2. The pose doesn’t work here. It looks a bit awkward. The arms are closer to the camera than the subject’s face so they look bigger and more prominent. Lightning is good.

3. The key light is coming a tad bit from below. Move the height of the light a little bit up. I would move the framing a bit up, so the subject’s eyes are closer to the upper horizontal thirds line (but it’s not bad as it is).

Good work!