What does 眉如點倉 mean?
点仓 is in Yunan province. It has 19 mountains.
Here is its wiki page 苍山 (大理)

眉如点仓 means the eyebrows are thick, dark, long -- imagine you look at mountains from distance. 

I think not lots of mountains can be used to describe eyebrows. 眉如五台，眉如泰山 would look very weird :)