Hey ^^ This is pretty nice ^^ But yes, you must color. The head should be erm... Under the hat O.o and the hat should look a bit more worn. You may want to make the eyes a bit brighter... As for coloring, the main jacket should be dark/navy blue with signs of heavy wear. The face part should be much darker than the rest of the body to make the eyes stand out. In case you need more of a color chart,

Reference Piccy!