Hi

I have a small oil leak near the hall sensor. Took plate off and I can see daylight (see photos). What should be here and what's the easiest fix?

A hole in the crankcase? Looks like a new engine to me.

















Joking aside, the timing chest has no gasket - it just has a bead of sealant around it. My guess is someone used a cheap RTV and a chunk has fallen out. You'll need to pull the cam cover to get the timing chest off; you'll need both the inner and outer cam cover gaskets, plus the twelve special rubber bungs under the cam cover screws. 

You have a choice when it comes to the crankshaft cover. The timing chest should wriggle off but it does expose the end of the crankshaft cover gasket. You can either run a bead of sealant across the exposed rubber gasket or replace the gasket and all ten special rubber bungs. I've done both.

OTOH if you've drawn up a chair in the cheapskate side of the room, you can just clean the area and force some sealant into the hole. The preferred sealent around here was (past tense) Threebond 1125 but it's not longer available. Threebond 1184 or 1215 should be good enough.

There is supposed to be an open hole at the rear of that opening where the arrow is and if oil is coming from that then the only place it can be coming from is the crank seal on the front of the crankshaft. It's behind the hall sensors and as Dai said the cam chain cover has to come off.
A good chance to replace all the old rubber gaskets and seals.