Since others may be hesitant to post I will get these started.... I do not consider myself to be an expert on man made objects, but here is a piece I did with leather and metal studs on a draft horse's bridle. I did all of the bridle with an #11 xacto. depending on the texture parts were hatched, crosshatched and stippled
Here is a small piece of a pillow that I did that a puppy was laying on (you can also see my signature) I used hatching mostly with a little bit of stippling in the darkest areas.