Read up on the "rule of thirds" which is 101 for every photographer. Rules are made to be broken as well but it helps at the beginning...
In general when taking photos of inanimate objects you're in for a catch 22. On the one side your subjects are not running out of the frame or you have to keep focusing to get it sharp. On the other hand this means that you can take all the time in the world to compose your shot nicely and expose and focus properly (which can be also quite challenging - the framing that is).
The first shot doesn't "wow" me. A few reasons are:
-other subjects are cluttering the photo (back of the car, the sign at the far end, the big tree on the right) and take away the attention of the viewer
- not leveled, the image is slightly tilted to the left
- lighting/time of day (to understand that, ideally you should spend an entire day at that location and watch how the sun moves the light from one side of the walkway to the other). It can make a world of a difference shooting the same place at dawn, at noon or late in the afternoon when the sun is standing really low.
- you shot this photo at f11, you might get also very interesting results if you go down to aperture 5.6 or lower if you can to reduce the depth of field. This way you can emphasize your subject more while moving unimportant elements out of focus.
The second shot looks nicely focused and exposed.
You chose to move the subject dead center which can make the photo look boring (that's where the rule of thirds comes in). Play around and move your subject off-center to the left or right, whatever your background allows you to do. With subjects like these it's hard to avoid "foreign" objects like cars and properties that don't add to the mood of your subject. You may get a nicer results by cloning those out during post processing.
Also straighten the horizon as the image is slightly tilted to left again.
Now in the last shot you almost got it with the rule of thirds. You place the man in the left third and the bottom third but too close to the border of the image. See how much of a difference it makes compared to taking the same image with the man in the center?
Always play with your composition. Take your time! If you can, use a tripod.
When shooting hand held, don't go lower than 1/125 of a second to prevent motion blur.
Best of luck!