This year I have two focuses:
Composition and Trees.
As for the medium, that's the harder bit.
My original plan was to use oil paint as I've dabbled a bit with en plein air oil painting last year. There is a lot of room for improvement.
I feel like I got worse as the summer progressed.
A lot of that is composition issues combined with nerves.
This year, life is strong and I have no idea if I could find 2 hours a day just to paint. So I've simplified my kit to a small 4x4" watercolour sketchbook, a tombo mechanical pencil (mentioning the brand name because it has a massive eraser built in that is one of the best I've ever tried), and my fude fountain pen (looks like someone dropped it nib down, but it makes amazing marks).
This is the minimum kit for making a picture a day.
I'm going to try to focus on simplification and composition - and values. The ink should make it easy enough... in theory.
Basically, it's a set I'm comfortable with, but have a lot of skills to improve.
My sample art took 20 minutes to decide what to paint, 20 min to do the sketch and line work, then 2 hours to paint with watercolours (because drying time sucks). Hopefully, things will speed up to just do the ink stuff. If time allows, I can add in some additional mediums (thus the watercolour paper).