I live in this world, so I'll jump in on this one!

I like the green stripe, because they don't fit the "rubber stamp" flame job. That sounds like the same idea as not using white, or having a large mass of it at the front.

I also like the scale of the flames, and the distance they go down the side. Many now days are trying for a nostalgic look with short flames, but they only make it less dramatic, and lose that sense of speed that long horizontal licks produce.

I can see your painters point about how skinny the flames are, as the body of the flames needs more length to flow. The example has flames that kind of "die" too soon and are finished by the pinstripes, but that is just an opinion. At the same time, he has plugged in many elements from the sample you gave him, and will have a similar overall look.

Looks like a solid design is emerging.