I really like the last picture, reminds me of Dragon Fist from DBGT (I can't believe I remember that XP). Don't really like the first picture at all... =/ The second and third one look great too, the lighting in the third one especially makes it stand out. Overall, I'd have to say a 4/5 (the first one completely ruined it).
the second one is the best imho. cuz it looks like he has a black visor. 3rd one is good, i just dont like lobsters. pics with spartans are way cooler. over all 5/5 great job