I need art images that I can't find searching google.
Allegheny has three subscription collections of high-resolution images (mostly on art and cultural subjects). They are:
Luna collections called Allegheny Arts and Humanities Collection, and Amica, a selection from American museums.
You can find the links to these collections and more instructions at: http://library.alleghey.edu/images, where we also feature links to some of the best free museum collections.