When I noticed the color change, I felt that dopamie hit.
The high contrast composition of the black negative space background and warm tones you used on the figure in the fore ground make a great frame/focus for the piece.
Her outfit is very cute, and seasonally appropriate for Hydrangea, and the warm yellow does well with the floral pink/purple/blue.
I was deeply satisfied by the the way you transitioned through the pink purple blue as well, as they all stuck with a range that I thought was appropriate for the flora, and I especially appreciated seeing the pupils and the nails changed as well.
Final thoughts, I think pose, especially the over the shoulder glance really emphasizes what you did with the eyes and her hair in general and I think it has a nice feeling of summer lounging to it.
Thank you for making this.