Planes are very popular this week 'roun here isn't it?
A litthe too dark on the dark side and quite strong shadow. a white reflector will have done the trick.
4 - DMC. There is only one 'tool' here (blade not inclusive) and ok, the trade is fairly well assumed but still only one tool. I like the shot though and the lighting, it is nice and clean .... but for me, meeting the Challenge is the priority.
Nice simple use of negative space. The shadow is interesting. I might lose one side so that it's not dead centered, although in this shot, it's not totally unattractive to the eye. I might up the contrast on the plane just a bit to show more of it's detailing.