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Is there any oil on the timing belt cover above the area you have marked? If yes, it could be the front crankshaft seal behind the Hall Sensor plate or, if equipped, the seals for the rotary breather vent tube. If its lower it could be that the timing chest/alternator support sealant has deteriorated and is leaking. Leaking head gaskets or oil sight glass could be a possibility too.
Clean it up, dust it with some baby powder, ride and then check for the source
3 levels of oil exiting its preferred location:
weepage, seepage and leakage, in progressive order of severity.
which would you call it?
weepage- don't worry. it takes a long time to accumulate, and by the time you find it, its just sooty looking, never really wet. takes many thousands of miles before you can really even see it.
seepage- don't worry too much, but keep an eye on it. might be barely damp with oil, takes a few thousand miles to accumulate an amount worth noticing.
leakage- fix it, probably sooner than later. wet, all the time. leaves puddles under the bike. size of puddle tells you how soon it needs fixing.
If it is indeed the timing chest cover, I've got a bunch of photos showing the repair process. I've been meaning to post them up but haven't had time.
Check the tightness of the bottom bolts that hold the cover on just above the seep/leak. I have had that happen in the same area when removing one of those bolts and not getting it torqued correctly.