Len, due to the vegetation, this looks like a roll cast situation to me. I'd start fishing upstream, casting to about where the guy is standing, and carefully work my way up to the root clump on the left. I'd give that area some special attention, then work on up to the riffle. The white water on the left would get some definite attention, if possible, I'd like to fish it from just slightly downstream or from directily across. Flies of choice would probably be caddis emergers or small streamers.