All taken into consideration he looks fine, especially for being in the butt-ugly stage of his transition to adulthood. Skin color looks fine on face, comb and wattles. With respect to the to the feathers I was looking for variations in width along a given feathers length. A bird in poor condition will produce feathers that are narrower and often of a different coloration along length where feather part was in blood while bird sick. It kind of like rings on a tree.
Your free-range area is hard to asses but forage quality can vary greatly. If I have any doubt about forage quality, then a grower is used rather than scratch, especially if birds cannot go as far as they want. Even if forage is good, I no longer use a scratch made of cracked grains, rather my preference is for intact grains even if of the same type. Some of the vitamins and fatty acids the intact seeds contain do not keep well once seeds are opened.
Try the mealworm trick suggested.