What exactly needs to be tweaked? Just curious as to me from the pictures they look nearly perfect.
It's just nits really like the joints telegraphing through the suits, which I think HTs will fix. The biggest distractions to the appearance is Bats cape at the neck (but we already know HTs isn't great with capes) and like VDG said, West body is too wide. He had a barrel chest and wasn't V cut or anything but he didn't have a fat wide belly. This figure needs a little tweaking in that area.
Other than that, it looks pretty awesome I think.