I have got an order to make a portrait of this dog. I have difficulties with the green colors, being too yellowish  mostly around the dog and on the shadow side of him. Is there a way to make the green more natural, and the dog shadow side less yellow, without changing the red colors of the poinsettias?

I have tried changing by hand, but it does not look natural, at least not on the dog.

Grateful for any tips

Gun

Are you going to reshoot the dog or just do postwork adjustments on the computer?

If your reshooting, check your whitebalance and  make sure its not set to auto, the lighting and colors may be throwing it off and adding a cast to the image.

For postwork, 

If you shoot in RAW...you can tweek the white balance settings and make other color adjustments

Or

you can also  experiment with a selective color adjustment layer (photoshop), as I find it gives more control over specific colors.

Joe

Thanks for answering.
I did not shoot it myself, got it from the owner in jpg, not more than 1200x800 in low resolution.
Since I cannot change the photo, I will ty to do as you say in Photoshop.
Even if I will paint it, I find it best to have the photo as good as possible to start with.

The result will be A4 in 300 dpi before I print it.

Hello Gunsan, I applied the Foliage filter from Nik Color Efex Pro to bring out the green, and then applied the White Neutralizer filter to remove the yellow color cast on the doggie... Is this what you were looking for..?

That leaf in the last picture stands out like a sore thumb.  I don't really see a problem with the shade of green it has in the first picture.

Thanks girsempa for the tip about Niks filters, I have them.

To 3DGuy, if the green seems to stand out too much I could layer it with the original,and test.

Now I am trying this out.

Maybe something in the middle, will experiment more, thanks

Very Nicely done!
There is another way to eliminate color casts using threshold values...but I won't go into it because what you have done here has worked well.

My only comment is to clone out...or put another leaf over the edge of the flower pot that sits just to the left of the dog.

You could balance the dogs colours on an adjustment layer and use the mask so that it only applies to the dog and leaves.

This one done very quickly with an adjustment levels layer.  Take center eye dropper and click on yellow shadow area on dog (by the left leg).   Fill the mask with black and paint in the dog and leaves in white. 
It could be done with a lot more subtlety on curves adjustment layer and spending more time on it.

Just a thought....you may want to clone out the (window?) at the top of the image as it distracts the views eye from the dog.   A consistent fade to black in the distance would work better (IMHO).

   

When I paint it, I will just let the window be very faint,almost invisible.
I think I already have what I need as a start for the painting. Yes I will clone the leaf color when I paint
Thanks all for suggestions!!

Well thats seems to have sorted that one out.. We do have a lot of expertise here well done guys

Amen.

Yes..Amen

It is  painted and printed, and the receiver was happy abut it.
Thanks again guys!