I'm nowhere near an expert at differences in species. What little I know has been learned out of frustration in not being able to find an actual L190. I haven't even come across a vendor (yet) that knows the difference. The L190's can be olive green/black striped but most commonly they're gray/black striped. They always have bright red eyes & they get up to around 18". The L191 Dull-Eyed Royals are usually olive green/black striped with very dull colored eyes & are extremely common, it's what most vendors have, they get around 9"-10" max. The reason I thought the OP's Royal was an L190 is because he looked gray/black striped with bright red eyes (unless I'm mistaken because the picture's not real clear). But like I said-I'm not a species expert at all.