Didn't have much time today so only got one done. But following Mau's advice I slowed right down and used a reference, measuring it out with a traced outline before going onto the full study.

A marked improvement I think, but still needs repeating many times to fine tune and make second nature. Thanks everyone for your help so far. I was definitely trying to run before I could walk by doing too much from imagination and not actually learning from having a reference to hand to observe.