What I think I got right:
The composition, splitting the image in three, both vertically and horizontally.
Colours in the blossom. I noticed that when the sun came out it brought the yellow out. Even in very bright, but slightly hazy sunshine it returned to white.
The blue/mauve colour note in the background, which actually disappears in the photo but was quite visible!
The light colour of the field behind the row of trees. This was the colour it appeared on a couple of occasions while painting, when in a spot of bright sunlight. Not for the first time it occurred to me that the magic of plein air painting is its potential of capturing the best of lighting effects over a period of time, not just a moment in time like a photo.
What I thought I got wrong:
The tree had more shape than I captured.
Sun shining on any surface always increases the chroma of its colour. My chromas are too dull in sunlit areas. My paint handling is rather crude.