see attached image, but basically having the images on the right side makes it so hard to "read" a post with an image, going back and forth with your eyes to "get" the whole post. So much easier to just put the images between the up-/downvote buttons and the text post.
I don't know if there's a reason for that besides looking different from similar sites. If so, I don't think this is the way, it really puts a strain on your eyes and our brain is not used to absorb information in this way.
Well some people do, in fairness, want things to be not the same. Thankfully given the platform it shouldn't be too much (for those that know what the hell they're doing) to offer up tweaks to cater to the oddballs.