Nice practise, I think your able to match the direction and size of the cylinders, and are able to tell if they're rotated towards the camera. But I do think you would benefit from taking your time on a few of the cylinder studies to get the shapes as correct as possible. making sure to get the elipse on the end of the cylinder the right angle, and trying to match the curve on each of the segments.
Still, lots of good stuff ^-^