I am by no means an expert here, but IMO, your splotches are too large...and its too light and 'brown'
I have made up my own camo several times, and I have always noticed one or two things:
1. use a variety of different colors, but within scope of the environment the soldier is in. (this rule can be broken...i.e. woodland camo in the desert and vice-versa) also, you do not have to camo the whole soldier--if the camo is particularly intense, camoflage only the bullet-proof vest.
2. do not be afraid to use a nuetral base color--grey or NATO green look good and are the most common.
3.you can use more than 3 colors, just because the US doesn't, doesn't mean you can't! On one figure I modified (due to a broken gun-he fell off my workbench), I used 5 or 6 colors. OD, light green, Black, Brown, tan, and Dark Grey--in a mottled scheme.
4. focus on using similar shades of color. Dark colors usually go with Dark colors, Light colors are not commonly used for camoflage, unless the point is to have a 'dazzle' scheme.
I guess that's four...
notice that all of these rules have exceptions, but not too the extreme.