I think the perspective is skewing the perception of the pen's shape. Would you take another picture with the pen the same distance at both ends from the lens?
The vertical/horizontal thing is annoying to say the least. For now take a picture with the camera held horizontally and a second held vertically. Once you attach the pictures preview the post and see which orientation they are in and remove the one that doesn't look right. Then nobody has to tilt their head.