I think this is high key and low key. These delicate, tiny blue/purple iris are blooming in the back. The bearded iris are gone and these little ones showed up.
Nice half and half work! The top is definitely high key to me- lots of light. Low key is usually darker in my mind- a lot less light therefore a lot less detail. But in the artistic realm you can interpret them any way you want. (I think the smaller blue irises are called "Blue Flags" but don't quote me on that!)
