This is off to a fantastic start! Great work! I went over this because something looked a bit off with the fireplace. It checks out on it's construction but its left side is directly on the vanishing point which calls a lot of attention to the side of the fireplace. it may work a bit better if you adjust it to the right a little bit so we can see the thickness and take it off that line. Take everything I say with a grain of salt, I'm a noob I just read last night in a Loomis book that the vanishing point can be used as a point of focus so thought it might apply here.