Sketching on flight #2 home, part 1

Houston, USA to Calgary was our second flight. I found sketching while in a middle seat difficult as I had to keep my elbows in (both people on either side had the arm rest) but I had a lot of time to kill. I sketched the contents on my tray table but wasn't able to colour it due to the lack of elbow room.

The second thing to catch my eye was the cute napkin under my cup. I pulled out one water colour pencil for this one but did not use water. United does have great napkins.