Mutant Lord (love the name btw), as others have said, I really don't think there's any pink in the color mix. I've had a decent amount of experience mixing the base color for this army. At first glance, the mixture appears to be from kommando khaki (not bone white) and a bit of some kind of true brown. Don't be fooled into using a brown with a slight yellow tint, such as snakebite leather. Using a yellow tinted brown with off white tends to make the end result favorably yellow. Don't worry if you actually want a little bit of yellow to show through the paint; the brown will natural do this subtly on its own. The same holds for reddish browns, such as bestial brown and dark flesh (one of my favorite paints). Avoid them.
For a 'true' brown, I've used two paints: scorched brown and/or graveyard earth. I prefer scorched brown, because it looks more true to brown, whereas graveyard earth has a very slight yellow and black tint. Good so far?
If you don't have kommando khaki, then you can use bone white. However, I've found that the mixtures end up being more consistent and easier to replicate, if I use colors that are closer to my end hue. Kommando khaki is a darker off white than bone white and is closer in hue to your desired color scheme. Hence, there's less transition to your final color. Also, if you're having trouble getting the mixture to work with scorched brown, due to an issue of hue, then don't worry; switch to graveyard earth. It will be easier to achieve the desired hue with graveyard earth, simply because it is a lighter paint and closer to your end color. However, if you're up to it, then scorched brown is still your best choice. As I mentioned earlier, it's a closer 'true' brown.
Next step focuses on neutralizing the colors or better yet, balancing out the colors. Have you ever had trouble with a color mixture going AWALL? Sometimes, when we desire to create a specific blend, we end up adding too much of one thing, and so try and compensate by adding another color. The final result is usually too rich. In order to balance this out, I like to add a moderate amount of gray to some mixes. This especially rings true when trying to add browns or yellow to off whites, which often result in a greater yellow tint than desired. Both fortress gray and codex gray work well for this purpose. I'd recommend fortress gray for you, simply because it's lighter. Also, for balancing a paint, it often comes down to the sheer volume of gray. Don't make the mistake of looking at a very light color mix, and thinking that only a smidgen of darker gray will do the trick. The mixture really needs a decent amount of gray. Obviously, a small amount of dark gray doesn't produce the same result as a moderate amount of light gray. Does this make sense? Volume can be as important as hue. In other words, adding a small amount of black to a white mix can sometimes actually produce a different color, than adding a moderate amount of gray to the white mix.
For this reason, I'd also suggest that you cut your fortress gray with 1 part bone white prior to adding it to the mix. Some painters will simply add the gray directly to the mix, and this works too. However, this removes any kind of safety net. I like mixing the gray/white separately and then adding it in. It allows me to make minor mixing adjustments to only the gray/white mix. It's just simpler this way.
So, here's the formula that I'd first try. It's been a while since I've made this color, so you may want to experiment with it a little before hand.
Kommando Khaki- 9 parts
Scorched Brown- 1 parts
Fortress Gray- 2 parts (gray mixture prior to adding should be 1 part fortress gray/ 1-2 parts bone white)
Best of luck. Be sure to post your paint scheme.