To put your mind at ease, next time you're done riding put a clean piece of newspaper under that area when you park it. It could be chain lube, fuel*, engine oil (countershaft seal leak), coolant (that doesn't look like it to me but overflow can still drain there) or it might not be your bike at all. Keep putting something under there until you find a leak or until you get tired of it.
I'm dead serious, by the way. I am the sort of person who needs to check that like twenty times before I finally believe it wasn't my bike.
*Some people may make a habit of putting as much fuel in the tank as possible (your owners manual will tell you not to do this) and not realize that the bike will just dump it out after residual heat from the motor heats up the fuel