What a cool issue to bring up Mark—my gut reaction would be to build out from a Permanent Alizarin Crimson and Cad. Red. There are definite hue shifts throughout so I don’t think just “one red” (without other colors) will give you what you want.
However, there are some cool tools out there to help you find a pretty good starting point if you feel lost. One such tool is Zsolt M. Kovacs_Color 2 Drop._
I shared a post about it here a while ago: RESOURCE:Zsolt Color Mixing Tools
You can pull up your image in Photoshop and sample some of the target colors:
Then you can take the RGB, HVC, or Lab values, enter them into the appropriate field, select a relatively appropriate paint set (or you can just choose a generic one) and the program will give you a few options on how to mix that color.
It can be very helpful if you feel like you are floundering in finding a starting point.
Unfortunately the program cannot be simply downloaded from Zsolt’s site. Here is the instructions on how to get it:
TO ACCESS THIS FREE SOFTWARE:
If you would like to use my Color Mixing Tools and download the system, please send me an e-mail message, so I can send you the access info. You’ll need two files: MCRInstaller.exe and ColorMixingTools.zip. You should download them together, because the version numbers must match. Please note that you are authorized to use the system only according to the Disclaimer below and you are not allowed to put the MATLAB libraries on the internet for any reason. However, please feel free to give the two files to your colleagues or friends, but only for educational purposes.
LINK: http://zsolt-kovacs.unibs.it/colormixingtools10
Here are some suggestions from Color2Drop for moving into the shadows (w/ Rembrandt Oil Colors):
Let me know if this helps! (and PS—never hesitate to ask a question. I guarantee you that your questions help many that are struggling with the same thing! :-))