As foetus said, you should use more layers to highlights; you understood which zones need to be lighter, but you need 1 or 2 steps more in your color range.
For example, paint all your flesh in a basic green (like GW' Goblin Green). Then put a bit of yellow in your base green (like Sunburst Yellow) to have a lighter green. Put this color on the top of muscles for example, on a medium large aera. The put more yellow in this mix, and rput this new colors on the "edges" of your model. More color variations you will use, more your enlightenment will look smooth a clear.
The rusty blade are good, but you should use more water in your ink wash (if you're using brown ink)
The base seems to be very clear, good job.
A last thing: you should use acrylic paint of course, but you should mix your color with water before applying it. If your color is mixed with water, and looks like milk, each coat will looks thin.
Post another pics of your orc army! =)
Happy painting.
This to my mind is tabletop standard and so deserves a solid 5. If you're looking for pointers, I'd say you're moving in the right direction with the flesh, but it needs to be blended more. Even one more intermediate shade of green to break down the contrats on the raised arm would improve it immensely. The swords/cleavers are great and you've given them a nice bloody feel, the helmet looks good and the mail isn't bad either. What I think lets this mini down more than anything else, however, is the face which is always where the eye is initially drawn to a mini. It's a bit of mess, frankly, and could do with more blending and highlighting to get rid of the bitty texture it has at present. I do hope you're not too disheartened with this criticism and take it as constructively as it's meant. I think there are a lot of positive points to be said for this mini and with a little more effort it could be really good. Cheers. Foe