Today with my 5DIII
On the first on, move to your left to let the bicycle fill the left side of the frame and your subject on the line at 2/3 of the frame. Search youtube for photography composition or rule of thirds.
The other ones you seem to be trying some interesting things. Keep experimenting and you will find what things work for you, those things that fit your personal artistic style.
In general, you probably don't need f16 or f22 with a 21mm lens. http://www.dofmaster.com/dofjs.html shows that you will get 2.3ft to Infinity depth of field, even f8 is 3.79ft to Infinity.
|Morning At Picture Lake by Buzz Lightyear|
from Dawns first rays
|AT-6 Harvard by jarud|
from Trainer aircraft
|Matterhorn by ewng|