I feel that I can't properly critique your color work (because I'm red-green colorblind :P), but it's cool to see how diligent and careful your studies are, @Jesper Axelsson. I agree with @Steve Lenze, the guys you're studying from are a great source for sure. Another resource that brought me a lot of helpful information about color and painting was Sam Nielson's course on fundamentals of lighting, over at Schoolism (https://schoolism.com/courses/art/fundamentals-of-lighting-sam-nielson). And yet another resource many people talk about is the book "Color and Light", by @James Gurney - I wonder if you've ever taken a look at it (I haven't yet). Keep it up!

Okay, What I learned about color is as follows: Hue- this is the color, but, it is relative to the colors or hue's around it. Value- it's dark to light value- most important. Saturation- the intensity of the hue, also relative to the colors around it. Colors that are muted or greyed, tend to be more harmonious with each other. Temperature- whether a color is cool or warm, also relative to the colors around them. Shadows- tend to be cool if the light is warm, and vise versa, if the light is cool, the shadows tend to be warmer. Warm light, warm highlight. Cool light, cool highlight. I suggest using a limited palette, it makes things way easier. Example of the relativity of color: In your reference, the shadow looks kind of green, that's because of all the red in the image. The eye will see the compliment of a color in other colors. It's great your learning from Todorovitch, he is an amazing painter, really great. I remember Bill Perkins from Disney, he's amazing also. Please keep posting these exercises, I look forward to what you learn :)