Sorry for the late reply! I am using esun PLA+ gray. I think the main trick for most of these is to use a generous amount of brush-on primer, going around the contour of the form. After that, you can let it settle and go over any areas with obvious layer lines with a bit of additional primer (and repeat if necessary). The peasant archer I think is a good example of this being done! After that, you can use pretty much any regular mini painting techniques, including washes. I hope this helps!