I tried the decal camo a ways back.
It was a frustrating experience. At least in 1:35/54mm. Figures, almost be definition, as highly irregular surfaces. Decals sometimes to not respond well to such surfaces.
"Best" (which is not saying much) approach was to spray the figure in gloss white overall. That's mostly so you can see where the decals are going.
Then, work with small squares and strips--I was using 5x5mm and 5x10mm. Also a lot of setting & solvent solution. In progress, the figures looked very much like patchwork, which they were.
Never really was satisfied wit hthe rult, either. Put three coats of clear flat on top. This allowed some use of shadowing effects, just not much. Added another coat of flat over that. The set to flesh tones and web gear. The layers of lat gave some protection for cleaning up uh-ohs, just not a lot.
End result was less than good, even for my ham-fisted skills.
They never were much worthy of photography, and the figures went astray in my last move, to no great loss.
Such is life.
Your mileage may vary.