Those are some interesting drawings... The first photo somewhat resembles Varanus macraei, having a black background with blue ocelli across its back, as well as a forked tongue. Of course the body morphology is disproportioned and all... As for the second photo, along with resembling a basilisk, I would say that it also resembles a Sailfin Lizard (Hydrosaurus sp.), and if these drawings were made on the same 'expedition' or trip, it would make sense that it is of some varanid species(macraei?) and of a sailfin lizard species, as geographically, both are found within Indonesia.. Quite possible...
Great photos, and thanks for sharing them. Where did you find them by the way?? Here is the original color plate of V. prasinus, done back in 1845 by Schlegel. Thanks for sharing!
Cheers,
Bob