Then you have never read any of my posts
I'm surprised the lens has made quite that much difference, but a bit more focal length was always going to help. The subject looks a bit under, so turn the front light up 0.6 stops and it'll look better still, then screening the background will sort it properly.
A lens hood is always a good idea for protection, but it won't do much there. Even if it was good and deep (which it can't be, or it would vignette at 18mm) it would only be effective against light coming from some way outside the image area,
and the problem here is all the brightness blasting straight into the lens.