its simple to draw a fire.....
use black background~!!!
and draw a rough shape of fire with yellow
now use orange ....try to make transperant ....50%....
and so at sides touch
cover inside with lighter orange
now use white ...transperancy level 30%....to 60 at centre
make sur you add blue ....might not have noticed.....you have blue colour on fire at close observation
now have black colour too at bottom
now draw flames....when drawing with candle please drawcandle first
now if you want can play with fire...while abstact drawing ...by using background colour(black)
so try drawing...if you made one please let me know