No!!!! If you look at photos of the undersides of rotary engined aircraft the undersides look a real mess. Modern rotary aircraft are notorious for throwing oil all over the aeroplane, pilot and anything else within 50 yards or so - you could add a little more and still it would not be overdone, especially if it represents the machine shortly after it had landed and the ground crew had not had time to clean it off. For once less is not necessarily more.
Stephen.