inspirations or plagiarism

On trip to Bergamot Station Mar 28 2009 I came across the work of Nobuhito Nishigawara.

It sucked me in and I found myself taking detail pictures of this work thinking maybe I can use these as source material to work in Photoshop.

Later I decided against it thinking it may not be kosher.

On the latest art run to LA the same thing happened with the work of Mickalene Thomas.

Finding myself once again wondering, is it kosher, can I use other artists work as source materials?

Throughout history artist have been inspired by the work of other artists.

If I used my photographs of the details of this work how would the artists feel about that. Would it be inspirations or plagiarism?