Hi Lee, I'm a new member here, and I'm hardly an expert myself... but in my humble opinion here are some comments on your figure.
Good things first, I agree with Einion. Your painting is tidy, and the details are picked out well. I actually think that one of the strongest areas of this figure is the face. You've done a good job with the skin tones in my opinion, which for me at least was always the hardest part of figure painting when I first started. Figures are much more unforgiving than tanks!
I also think that the ground work is very good too. You've got a nice mixture of mediums there, foliage, helmet, stone. It makes for a nice scene.
I also think that maybe thinning your paint more is a good idea. In the highlights you've done so far on the coat, it seems a little thick, and comes across a little chalky. Are you dabbing the excess paint off your brush onto a bit of paper or tissue before applying it to the surface of the model? I found that really helped me. Originally coming from a fantasy model background I was used to extreme highlighting and strong bold colours. When I moved over to historical subjects I tried a lot to tone things down and be subtle. So for me thinning the paint very heavily to a milk like consistency, and then unloading the excess onto some tissue really helped. I learnt on a personal level, that less really is more, and that building up succesive layers of colour could give really great results.