You can create depth to a figure which lack folds in clothing with this technique. Wet brushing, I will use the thinnest brush I have, the brush that started off as a size 1 and through loyal service is down to its last few hairs. Highlight the folds on tunics, leather parts that would catch sunlight, a nose ridge, cheekbones, and weapons as well.
The last photo is the completed DBA Early Polish in battle array. Cheers,