You need to correct the colour noise.
Thank you for your note - I could not identify some striking color noise, but I will look for it again!
You could also make the picture a hint warmer and play with sharpness and local contrast (texture, clarity, structure, whatever it is called in your editing program).
Thank you again, the image details are really helpful! I shall remaster the pic with the aid of them. - A warmer coloring would not be advisable, I think - the picture was taken in february, so the color temperature corresponds to the real light situation. I would be reluctant to change it ...