Thanks- That's one of the details I like about the Mig-29, although you see it on other modern fighters as well. I did it venting from the breach, but usually you'll see it just behind the muzzle of weapons that are recessed into the wing root or forward fuselage. Usually they'll be a steel or unpainted stainless steel louvered panel, as it's more heat resistant. In art terms, it lets something more interesting be done with the smoke and light from a muzzle flash than just the usual.
Yes, with a couple more things thrown in. The nose light is taken from something I saw on a pre-radar british fighter (I think it was a Vampire) and the cooling louvers were stolen from the FW-190A. The gunmetal speedbrakes on the engines were stolen from 1980s anime.
I'm glad you like it. I learned a lot doing that book, and I came away with a few pictures I feel very pleased with even now.