Masking colors on the body and face

Break your silhouette and become an invisible part of the forest. The camouflage face paint will hide you from the curious eye of the enemy, much like how the Ring was used to hide Frodo (not that the Nazgûl will come after you, you know). Choose the right pattern, for example, diagonal stripes of alternating green and black, and don't forget the eyes, nose and ears, the human eye notices repetitive unusual shapes in nature, so you have to hide them.