I have a mystery oil leak coming from my engine. It looks like the oil is running down and finally falling onto the ground from the transmission. Ill attach a few pictures. Where are come places I should start my check?

This is an upside down picture of my transmission and base pan.

 

Could be from the valve cover gasket. I had the same issue though on my 22RE 4 cyl and it appeared the xmission was leaking. After replacing the gasket it stopped.

 

Rear main seal?

 

you need to clean everything up REAL good, then recheck for leaks.

 

Ok thanks guys, It ended up being the oil filter. Replaced it and it stopped leaking!