This image is actually very easy to color, especially in the larger size.  The colors that were used are the following:

SMALL:  Hat,Chaps: W5,W7

Boots:  E35, E37

Skin:  E00, E11

Rope:  Y21, YR24

Other:  BG000

LARGE:  Hat,Chaps W7, 110

Chaps:  E35, E57

Skin:  E00, E11

Rope:  Y21, Y23, YR23, 

Other G20

Sentiments:

OOPS!  I forgot.

To say Happy Birthday

To say Thank You

To say I Love You

or

I'm a little behind

(but, it's a cute behind)