Woah! This is so cool!!
The clothing and breathing mask reminds me of Fallout!
https://vignette3.wikia.nocookie.net/fallout/images/a/a7/Merc_grunt_outfit.png/revision/latest?cb=20150118014720
https://vignette2.wikia.nocookie.net/fallout/images/5/5b/Breathing_mask.png/revision/latest?cb=20110925154328
Anyway, well done!
Good luck on the next stage of the drawing, N!
See you later!
-E.