I'll take a stab at this since im intrigued...the one on the right when paired with the wings reminded me of the modern wasp from marvel and the one on the left remindes me of a spearman... dont know what specific spearman but his helmet reminds me of a some spearmen wearing a hat and is either bald or has long hair plastered to their head wither that or this is a representation of a polish spearmen wearing a helm; the straps also look like an upper half of clothing holding up a lower half.... either way though this design is most impressive and im quite facinated by the design,however im quite curious what made you use the straps mind explaining your thought process?