amazing quality, shading and color pallet but the sizing of the face doesn't fit the head whatsoever
you should try to make the face taller and just a tab bit wider
take some previous references from dengue who has made tons of humanoid textures

another thing that id say is that this concept has been redone and made well so many times it's become pretty bland
it doesn't take away too much from the quality, yet i'm sure you can get more creative