#5 makes me go a bit cross eyed. I find the shadows a bit too intense and wonder what the image would look like if you could shoot it up from below the white surface.\
#4 I would level out the white surface as it's currently angled down to the right, I would also remove whatever that ledge is in the back. I would also try to shoot through the bottom, with maybe a white reflector up top pointed down to capture some of the fall out to reflect back down.
#2 I like the idea, maybe have the bright light focused where the filament is in the bulb, which is where I anticipate the brightest part of the bulb to be.
#1 I would just level it out.
Not sure why I went in reverse order..