Looked pretty jacked for a natural guy! Good stuff! Physique (especially amateur) has more to do with the aesthetic proportions of your body rather than size. It's judged largely on width and development of your back, chest and shoulders, with arm size and development I think coming next. Calves of course are always considered as they indicate a thoroughly built body - many amateur physique guys sip legs too often because their quads are hidden. Big mistake if you're looking to win.
To me, your arms look a little more advanced than your back, and slightly more than your lateral delts.
Looking good to start prepping for a show a few months down the road in my opinion.
Points of focus should be on developing lower-lats and adding some width and v-taper to your whole back, rear deltoids (look like a they're lagging a bit too - might just be the photo), and overall chest mass.