I don't know the method well, but just from what I can see, and speaking as a sailor, climber, and mountaineer, your knots are terrible. I'm sorry to sound so harsh, but I see no other way to put it. The slip knot on the noose is not "dressed" properly (neatened up so that it acts the way it was intended to act), so it probably won't tighten reliably, and the knot anchoring the rope on the far doorknob looks like only a single half-hitch, which will probably loosen as soon as you start twitching, if it doesn't first come loose as soon as your full weight loads it.
At the anchor point, you need a minimum of two half hitches around the standing part of the rope --the end going up toward the top of the door. You also need to leave a handbreadth of tail --leftover end of rope-- outside the knot, so that the end doesn't slip back through when a load comes on the rope.
For the noose, you need to practice your knot tying skills until the slip knot looks as clean and concise as the one @Superfluous suggests. Just twisting and turning the rope in the right directions doesn't mean the knot will work properly, the twists and turns need to be in the right relation to each other.
Again, sorry to be so critical.