I used my favorite pen in the entire universe, a Pigma Micron 005, to make this. since each skull normally is a whole 8.5" x 11" sheet of paper in size (with a few small exceptions at the top of the page), these are not small, and Citipati osmolskae, my first completed in this series, is my best and favorite. Each one has a scale bar and is named. The name "Ronaldoraptor" appears in the book written by Henry Gee and illustrated by my friend Luis Rey "d_bbs_ur_1/102-1366306-0020944?v=glance&s=books&n=507846"A Field Guide to Dinosaurs", published by Barron's, and comes from an animal inspired by a skull that is currently in private hands, though I've seen photos of it and Luis has a cast, all of which contributed to the skull with that label. The most recent oviraptorid, Nemegtia barsboldi is on the third row, fourth column, and is probably one of the ugliest oviraptorids, and this is saying a lot since they are one of my favorite groups of dinosaurs to study.

I am ashamed to admit the skulls of two other oviraptorosaurs are known and are not illustrated, that of a skull referred to Chirostenotes, and a new specimen now at the Carnegie museum that will probably be described before the end of this century. All of the skulls are arranged so that the jugal is nearly level, to show the ventral flexion of the snout that characterizes a group of oviraptorosaurs including oviraptorids, caenagnathids, and Caudipteryx, but not Incisivosaurus. Skull material but only jaws are known for some caenagnathids and Microvenator, but are otherwise not comparable to the taxa shown here. Incisivosaurus is the only taxon known with maxillary (or dentary) teeth. The skull of a likely basal oviraptorosaur close to Incisivosaurus, Protarchaeopteryx, is also known, though virtually no surface bone material is known except for the dentary, and the skull is a crushed mass resembling Incisivosaurus'. Otherwise, according to Phil Senter, they are probably the same genus, but different species. I have not included the other oviraptorosaurs I've mentioned at this time.

Edit: I decided to include the skull of ZPAL MgD-I/95, a juvenile oviraptorid from the Djadokhta Formation, whose lower jaw preserves a curve similar to that of Ingenia yanshini, and a close "ingeniine", Heyuannia, which I will use here as the skull of Ingenia yanshini. I also added the remainder of the skull of Avimimus portentosus, PIN 3907/3, which is restored after Incisivosaurus, Protarchaeopteryx, and Caudipteryx (the snout appears to lack teeth unlike the above species, suggesting it is closer to toothless oviraptorosaurs than those three others).