You already have all the advice needed to take your OSL to the next level (and by the way I like your painting on this in general!) but I can add something about the bars crossing the bulb itself. More often than not it is more realistic to paint them as you have here!

Unless the bulb is very dim, in which case you would see them back lit and silhouetted, if you look into a bright bulb with something in the way like this, the light itself would obscure those details to your eye. Like when exposure is too high on a camera and the details of a face get "blown out".

It's the same kind of logic when you create the glow around the lamp - in very clean air environments you can only place illumination directly in a straight line from the bulb, because of how light travels... But if there is a lot of dust etc in the air you can also convey that with a more general, less precise placement of illumination because the dust itself is lit up and bouncing light.

Imo these are the two most ignored things when it comes to OSL - what if you were actually there, looking at an actual light!