@outback , the shirt looks white, so the overall balance seems okay.
The shadow under the tree is a bit too green for my taste, but it hints at the possibility that the grass might have been greener. The sun stands high and close to noon lighting does not do much good to dry grass… Moreover, NLP is not a silver bullet imo, but a way to quickly get a good starting point.
Santa Color is “yielding results with punchy reds and lush greens” and I suppose that the dry green of the foreground is pushed towards red by Santa. After all, this film is not intended for true-to-life colour rendition.
You can try to make the grass look different by means of NLP’s 2nd tab tools, but it’s probably easier to work on a positive copy and with a local adjustment.
@outback , welcome to the forum and NegativeLab Pro.
BTW, I like the image as it is shown by @finn_l . I’d leave the grass as is, but would want to desaturate the shadow under the tree. Result wouldn’t be like much of Santa though 