Not a critisism , more an encouragment .
you know thats a good start really , the only thing i would say is to use blacklining in between details , i dont know how many people like to use it , but i use it extensively especially to bring out the colours of clothing and belts and so on .
i actually go over the little fellas quite a few times with a thin line of black to differentiate between dertails on the figures details , some people even use marker pens , but its really not that hard to do .
Once ive painted and detailed the main parts of the uniform in whatever colours they are , i black out all the armour and clothing bits in a wash of thinned black ( have a look at my fortnights contribution of my latest swordsmen on the "tale of painters blah blah blah " , bad photo i know but you get the idea ) , once i have the basecoat of black its very easy to pick oput the details in other colours , it really helps with the contrast , it is not to everyones taste , but i tend to paint x30 figures at a time , so it makes my job easier to paint them in a production line manner .
you might also want to highlight a few colours to get some depth , ie: the shaft on the halberd , try a streak of a lighter brown , on the red and blue try a tiny touch of a lighter shade of same colour on the clothing creases , and on the face a tiny dot of lighter flesh on the nose , chin , and cheeks ( even the brow if you can see it ? )
layering your colours makes a difference too , it is very hard to put a light colour over a dark colour , so keep in mind when painting where you plan on putiing light and dark colours over one another , a dark colour always shows through , just plan ahead , its easier in the long run .
i like what youve done with the red/blue livery colours over a white unifrom , it looks good .
all in all youve got a good start there , cheers tom