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I apologize if this has been discussed already.

My question is what are some good techniques to get an ambient glow around eyes (i.e space marine/tau/eldar/ eye lenses or on tanks/skimmer engines).
I was thinking of trying to drybrush the selected color around the eye, maybe adding a bit of white or grey to soften it up, but my current well-seasoned drybrush is to large to use on these small detail areas. Any ideas are welcome and appreciated. If it helps I am mostly using greens and blues for the colors I want to try this on.

Thanks all.

I have very limited experience with OSL and you will likely get alot more helpful responses shortly after mine. However a few tips I have picked up are as follows:

The brightest light is at the source, in this case if you are adding white it is in the centre of the eye, and from there the colours get less bright as they eminate.

A glow brightens, not darkens. This means the glows shade will be brighter than the surface it is making glow, if you make it darker the effect wont work.

You dont -need- to dry brush it on, with thin layers you can put the glow over an existing colour with a hint of transperency, or by blending it into the surface you are making glow it can subtly blend in.

the way i do it is by painting the eyes a very dark color of hte glow you want to achieve...and be a bit liberal. then i put the bright glow color like a dot or so in the eye actually making it an eye and not just a black blob or something.

then it's a very thin layer on the surrounding parts, usually a watered down version of ht eglow color i'm using, this will then let the darker color through and as a final i just do a glow color highlight on the edges and hey presto a not so bad looking effect...i'll upload a pic of my terminator soon for a look see.

http://www.dakkadakka.com/wiki/en/Zenithal_Airbrushing,_OSL_and_Snow_and_Ice_Tutorial,_subject_-_Grey_Knight

Go to step 6.

Best Zenithal/OSL tutorial I've found thus far

ADD: Just found this:
http://www.coolminiornot.com/articles/1288

A search for "OSL" tutorials should give you plenty of hits, aside from those already listed. Drybrushing is essentially the "quick and dirty" method - it's as fast as... well, drybrushing, but the results are rarely particularly realistic or attractive. Airbrushes are ideal for laying down thin, transparent layers and smooth gradients, but not everyone has one (or the skill to use it on small areas, like eyes). When brush painting, the key to good looking OSL, aside from basics like color selection and placement, is working in numerous, dilute layers to build up a smooth, transparent effect.