Mom

[Todd]

I like these unapologetic looks at topics like this. 

Here are some suggestions to consider:

Might want to consolidate some of this into the title:

Mom's Face

A couple line notes if you like a title shift like that.

Mom

lines like crevasses in a deep desert canyon--probably a bit long when looking at the rest of your lines. If you move face to the title you could try something like "carving lines like crevasses" as line one and move the rest to line 2. I don't have any problem with the content just slightly with the arrangement.
carving a face--My main issue with this is that it's largely unnecessary. We sort of know what lines your talking about already.
time dragging flesh from bone--I don't think time is needed canyons are formed over great time so the imagery already takes us there. The dragging flesh from bone though is solid.
melting into dust--No issue with the ending. It feels right.

I realize we don't always comment much in miscellaneous. So, I hope that isn't too much.

Best,

Todd