The only time Indy looks that sinister is at the very beginning of Raiders and I guess when he becomes evil Indy in TOD. They're replicating the Amsel poster, I wonder why they didn't go for that expression as well.
Agreed. The Indy smirk would have been much better. Heck, just about any other expression would probably have had more of an Indy vibe than the one they went with.