it shows oil on the exhaust so it must be coming from above ( cams ) cam shafts top of the engine, the oil leak is down the side of the engine so investigation
Probably valve cover gaskets. Then again, without additional photos can't really commit. As much oil as your photos show, it could even be a rear main seal. Hard to say. As for the overheating, if you've been leaking oil, make sure you check the oil level.