There are abundant PS brushes in the Marketplace.  I've seen one by Designfera that is called Cracks.  Have a look at that.bruxh set.  It may be what you are looking for.  You can put the cracks on a separate layer in PS and make whatever adustments you want the use a blending option to refine the appearance wth the image layer.

“Music is harmony, harmony is perfection, perfection is our dream, and our dream is heaven”
Henri Frederic Amiel