Not bad. I like the moustache and the shading in the area of hte beard. Good job for an old Tamiya figure.
Couple things to consider, though.
The uniform is very monochromatic, shorts, braces, belt and shirt all appear to be exactly the same color. Minimally, the buttons and buckles should be different colors, if only for artistic interest. Some variations and highlight and shading would pop these up considerably. Skin tone could be warmed up and tanned a bit more, these guys were in the North African desert. While this won't be seen in the end, the color of both socks has been run onto the bare flesh of the legs. Also, the flesh color by the left ear has run over the ear cup.