I've always admired your work, the collage effect of the aged "paper" background and the simplicity of your rendering. This, in my opinion, is the best one yet.
Best marks for originality, in which the scene is immediately recognizable and yet not actually derived from a specific screen of something from the episode. It's like a visual "reading between the lines".
For both vision and impact you have hit the perfect emotional balance. Touching all his memories in the form of children's drawings. It's as if he spent all those hundreds of years on Trenzalore retelling his adventures to the children.
The technique is uniquely yours, and this particular drawing highlights the best qualities of your loose, simple style.