>>95888781
Dont fear the freehand. You can always cover it if you fucked up majorly. And for minor fuckups, you can fix it easily.
For the fire, do your basecoat and do red zig zags which will join together. Straight lines, no need to be flowy wavy.
You can keep it red or add a touch of orange on the bottom. Then a tiny bit if yellow on the base of the flame.
I think painting minis are a lot more fun when you can do wild freehands. Try it out on your next army.