Clapy made a comment on my spread collared shirts about two months ago, suggesting that I make the collar higher. I got three made and am really happy with the results. I had an extra 1.5cm put on, which of course meant that they had to lengthen the collar (wings? what are they called?)
I think you could add another 10mm to the height of the collar band, it looks fairly low to me when compared to the blade length. If there was slightly less spread, it would also give a better sense of height.