I'm building this for fun and for play.
I was introduced to epic 40k last year by Settra, but since I had never played anything related to the GW universe (except Heroquest, lol) it took me a while to understand all of this .. in fact, I am still trying to keep up.
I am (slowly) building my army of Salamanders, got myself a Space Marines Battle Company, Rhinos, Whirlwinds and Hunters, and Land Raiders to convert to Helios.
In the meanwhile I've been playing with my friend's Ultra Marines, to learn about all of this.
Rastamann, I'll try to, but to clear any doubt, I can at least explain: I basically drew the yellow flame with a 4/0 brush, outlined the yellow (Citadel Flash Gitz Yellow) with the red (Citadel Evil Sunz Scarlet) again with the 4/0 brush and then, since the red would have "died" in combination with the green, I used one of my comic strips pen to draw the black outline
: a Pigma Micron 005.
For the lava effect on top, it's all in brush, but I watered the red so it would nicely transform into yellow... due to the scale I thought that in the flames this process would not come out ok, so it's stricktly red over yellow.