"High" is an interesting concept which had me looking in the wrong direction for quite a while. The reason being was that it is easy to confuse high with tall. Tall buildings and other structures did not, to me, convey height. I eventually found what I was looking for - some workmen washing windows on a tall building from a cradle suspended from the roof. I needed to convey this height and at the same time not to lose them into insignificance. My method, in the end was to crop tightly in a narrow crop which exaggerated the height and at the same time ensured the figures were still visible in the cradle.
High: ISO 200 300mm f16 1/125
Returning to ground level, I wanted to show flowers at ground level as this, to me immediately suggested the concept of being "low". The opportunity arose a few weeks ago with snowdrops growing in local woodland. Here I added to this concept by including the trees in in the background.