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.
I think exposing various settings to control the position of thumbnail would be pretty handy eventually. Got to not go overboard on settings but giving some options should help users find a layout that works best for them :)
This is sometime I wanted to tackle since it looks like the layouts are CSS templates. But I'm still getting the project set up