pak'ma'ra: dull paintwork seems appropriate for the carrion-eaters. Nice use of purple details along with shading on the front grilles of the big ships.
Ipsha: nice work on the globe! And judging by the green engine bulbs, possibly some pak'ma'ra Sunhawks, not a scheme which is often seen but looks good, especially since the Sunhawk was originally designed as a tribute to the green-engined Blake's 7 Liberator. Also a nice Xill in the background; a metallic base plus light blue highlights means the blue bits do seem to glow nicely if you get the lighting right - you did.
Drazi: nice design of ships + subtle shading + bright painted engine bulbs = awesome! Being a fan of ships which actually appeared on "Babylon 5", I'm more interested in the Sunhawks than the others, but again, subtle shading plus bright engines = nice work. Your fleet could do with a couple of Warbirds, partly for completion and partly because I'd like to see your paintwork on them.
Gaim: grey base plus bright coloured highlights, not a method I've seen often but works very well judging by your fleet.
Centauri: one of my favourite fleets with their retro SF style, to the extent that if things had gone differently (if Mongoose had not dropped the B5 licence, for a start), I might have built up my own Centauri fleet. Your paint jobs with the purple and gold, lightly shaded, do their fleet full justice. Given what I can see of your work on the bigger ships, I'd be interested to see better shots of what you did with the Vorchans.