Chris "takes the bacon" on the actual cockpit photos. I don't think you're going to find better than that.
Here is the best cockpit illustration I could find of an H model. There may be minor differences between the P and H model cockpit layouts (if anywhere, probably with the engine gauges / throttles as the H model switched from the Daimler Benz 601A to the Junkers Jumo 211A engines), but this should be pretty close. If you want a complete set of detailed drawings (primarily of the H model, but also including the P model), they can be purchased from Luftfahrt-Archiv Hafner for 59 Euro plus shipping.