In that sense, you're doing great. He surely looks malnourished. I don't know what your professional background is, but you might want to look in vitamin deficiency, kwashiorkor, and marasnus. In vitamin defficiency, look out for the following terms.
- Hidrosoluble vitamins
· B1 (Tiamine): Beriberi & Wernicke's encephalopathy
· B3 (Niacine): Pellagra
· B9 (Folic acid): Anemia
· B12 (Cobalamine): Anemia
Libsolouble vitamins
· A: Night blindness
· C: Scurvy
· D: Rickets & Osteomalacia
· K: Impaired coagulation
That's pretty much all you should. Read about it in Wikipedia. It'll make your game more interesting. For instance, vitamin B1 defficiency causes Wernicke Korsakoff syndrome, which makes your forget things, and start making them up.