I did the same thing over two mornings last weekend and, agree, that it is great to really concentrate on one subject and explore what you can do from different perspectives.
This is one of them. I still have more to finish and post up here.
For me, for its sheer simplicity (achieving that is, I think, always a great skill) and 'uncomplicatedness' (if there is such a word), this is my pick of this set. I do think it needs a bit of a rotation to level it up, but I love what I call the 'harmony' in the scene.