It looks like you got a hit on that triangle shape of the main section of that cabin and there are those horizontal lines coming from that shape that indicate the rectangle shape of the section on the right of it. Good hit!
The mouse is ok when it comes to doing quick gestalt sketches for these RV tests but once we progress to more detailed renderings of the target in these exercises, we will have to use either a tablet or simply draw them out the old fashion way and then scan them onto our computer. It's pretty impossible to do detailed drawings using only a mouse. lol