Since mine is done digitaly, I typiccly just like to make a shadowy figure, and duplicate it several times over. It's not really great for colored pictures, but I think the atmosphere and tone of my comic helps make it blend just a bit better. Also, this is an older drawing, and nowadays I'd put a lot more effort into actually layering and sizing everything properly.
In this scene, in particular, I made only the front row have eyes, kept the figures in the second row extremly plain, and the back is just a long rough shape of the same color.
Also, when it comes to animals, and because my art work is digital, I can just duplicate the same more detailed thing over and over again. Because THIS particular scene is in an underground burrow, I was also able to darken them as they got further away.
Here, minewhile, I tried to be a bit clever when it came to cutting corners. These are all corpses that are months old, and were all buried together, so I figured that since they're decaying, their more unique features are going to be gone by now, and when it comes to funeral suits, why do they need to be so unique and distinct? Even the body position could remain the same, because it's a standard way people are buried.