You won't always get the colour you need by mixing just two colours. The photo above shows the process of getting the colour from the image.
Colour on the left:
I looked at the image and thought to myself 'this is some kind of pink' so I added a bit of rose to the sugarpaste.
A - I put the pink near the image and thought 'the pink in the photo is more peachy (yellowy)' so I added a bit of golden yellow.
B - I once again put the ball near the image and noticed that the colour in the image is more dirty, so I added a bit of black.
C - The created colour seemed too dark comparing to the image so I added a bit of white sugarpaste to it. (I was happy with the colour, but by the time I took the photo the colour darkened a bit ;) so remember to keep that in mind too - that the sugarpaste gets a little bit darker when you leave it for some time)
Colour on the right:
I looked at it and though to myself 'I see blue in this colour', so I added some sky blue.
1 - 'I also see a tiny bit green in it comparing to the blue, so I need to add a tiny bit of yellow'
2 -' Comparing to the photo the colour is too bright... I need to add some black to make the colour a bit more dirty.
3 - 'Now the colour is too green and too intense, I'll add some white sugarpaste and a bit of blue colour.' (same thing as above - by the time I took the photo, the ball darkened a bit ;) ) - I should have added a bit more white ;)
Image source:
design-seeds.com (they have some beautiful colour palettes btw! )