My old Nanotyrannus drawing

I don't know when exactly did I make these drawings of Late Cretaceous tyrannosaurid Nanotyrannus lancensis (Bakker, Currie & Williams, 1988), but it was probably sometime in the late 80's or early 90's of the previous century. I think that I used the photographs of the fossil published in Discovery magazine as reference. According to my knowledge at the time, I drew theropods with lizard-like lips.