Green and Blue shades

I actually have three rather big acrylic paint tubes with shades of green:

• A 150 ml tube of Hooker's Green (System 3, Daler & Rowney)
• A 100 ml tube of Sap Green (Pebeo)
• And a 59 ml tube of Phthalo Green (System 3)

All three of these tubes were bought a long time ago. 

I started the painting in order to practise some mixing with adding white or yellow, even a bit of black in order to darken the greens. I also added some greenish blue. 

I enjoyed the painting, but somehow I have the strong feeling that I really need to do a color chart, starting with my greens. I've got some not very expensive watercolor paper from the 1 Euro shop which will be a perfect surface for color charting.