I'm 6ft.2 bro...
Coming from someone an inch taller than you and with a similar lanky build, the arm in the green shirt pic is 13.5 inches if you are lucky; and I mean very, very lucky.
Two inches on top of that would look decent, but everyone lies about arm size anyway so "public opinion" is that 15 inch arms suck. In BB terms its nothing even close to special but normal people might notice.