That is an awesome looking army - Keep up the good work!
If I had one suggestion it would be to highlight the skin more. Compared to the army and the impressive amount of details in the cloth, metal and general plating, the skin falls quite flat currently. Be it brown, white or yellow the skin needs more pop to not fall short of the rest of the models.
The Ogryns in particular is a good example due to the larger surfaces of skin, where it seems like it's only a base and shade that is used. The cargo effects on the pants are damn good, but it makes the skin appear unfinished in comparison.
I really like the color contrast you got going in the models though (that blue is close to the eyes on my own models, which I have a weakness for
), so do keep it up