And this is what I was aiming for. The telephoto lens compressing that perspective to make it look really crowded (as it was - nearly 1 million people packed into a very small park in central Sapporo), and a nice high position so I could shoot down over the heads of the people and really look along the street to fit as many people as possible.
It's vital to have an idea in your head of what you want to achieve in a picture. You usually have to spend a bit of time and thinking to achieve the effect you want but the journey is half the fun. Just remember what your different focal lengths do on your lenses and you'll be taking a big step towards achieving what you want from your pictures.