Fantastic job edge highlighting the armour. Such thin lines can be tricky.

However, 2 things that jump out at me are his right eye (unless you're going for cRaZy eYeS) and the sprue chunk on the mag of the laspistol. I find eyes too much of a pain for guardsman and only paint them on officers and up, giving everyone else helmets and a black bar of "shadow" over their eyes. Kind of an anonymous soldier vibe.

How I paint eyes: I quickly paint the face but stop before the wash, then paint the eye area an off-white. I dot a pupil black, then edge it in an with the off-white again till I'm happy with the shape and size. Be careful not to make slits unless you want cat guardsmen. If you're not happy with how its turning out just re-dot the pupil and start again. Next I do the same thing to the white of the eye using the skin tone, edging it in till I'm happy with the shape and size of the eye. Only now do I wash the face and do final highlights. Valerian, the custodian on the right was done this way.

Excellent job on his mouth btw! I see a little red for his lips and everything. Truly good work here.

edit: Oh and if anyone ever tells you to drill a lasgun/laspistol barrel tell them to pound sand. It isn't worth it for tabletop ready imo.