@Soxii, regarding osl. I guess that's what I was going for. It's definitely a very harsh light - not sunlight, hence the white reflection spots. Thank you for the compliments. I was aiming for a really stark chiaroscuro like in a Caravaggio painting:
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or like a noir comic. Perhaps they're under a turret spotlight? My first attempt was on a Tau crisis suit model.
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At the time of painting, I was so proud of my job on this model. I showed it to the bloke who runs my local Games Workshop and he complimented me on my highlights and then suggested that I could make the dark darker to really pop the contrast. He introduced me to lahmian medium and gave me a bit of a lesson on how to use the stuff. I've got to say, the helpfulness and inclusiveness from GW staff has improved so much since I was a kid. Great guy. Anyway, that's where the space marine experiment came in.
Also regarding OSL - I tried to do some glow effects on a Tau Ethereal's weapon using a combination of dry brushing and glazes:
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I'll definitely check out some tutorials online - I've watched some warhammer tv vids and I think I've got the mantra of "thin your paints" down pat. Any recommendations for tutorial vids or blogs?
@Crowsfoot &
@Jorgik I think you both are so right! That's the way to do it.