Color Doodles

I've been looking for a small, convenient way to do some plein air sketching.
I figure if it is small & easy to use, I might actually use it rather than having it just sit on the floor of the car! This past weekend was the first time I tried this Koi box by Sakura that holds a postcard-size pad in the lid. I had an errand to run and on the way home, I stopped for 25 minutes at the local park and painted this view of the pond and garden.

This was easy to set up and put away (although I still managed to get paint all over my hands!) And I was able to hold everything including the paper towel in one hand.

I have to figure out whether to use a pen first and the paint color in? Or paint with first and then define with a pen?

In the above painting I only used paint and no pen.