This is a collection of creatures and monster concept art from Mauricio Ruiz.
Ruiz is a conceptual designer and character design specialist with an impressive list of credentials that includes numerous television and film credits, including the upcoming Predator and Godzilla: King of Monsters. The art selected does include some concept art from R.I.P.D. The rest of it is either personal projects or there were no indications as to what they were created for. You can view more of the art here. Check out the images below.