I think you've managed well, it's easy to forget the size of minis while being on this site...
The one thing I can say that would really improve your painting would be to use thinner paints and to make them blend a bit better.
You've picked really good colours and have an eye for where the highlights should be. Now, just practice to make them smooth transcitions
first of all,i like the base and the old school term armour.
its a bit weird that hes got a jumppack as well.the staff looks a bit wet.
the main problem are your metallics id say.flames are good as well.its a bit too...flashy for lod,leave the blue away,and mix the red of the flames with a bit of brown.hope that wasnt too harsh or anything