How to improve your photo
Always expose for the shadows. I am not sure if you work in RAW or JPEG, but exposing for the shadows gives you the structure in the shadows. Exposing for shadows will over-expose the highlights, but with a canon you are able to get the details back in the highlights very well. This is done in Photoshop or any kind of other photo editor. The main advantage of exposing for the shadows is that you have sharp details in the shadows, they don't become fully black. At the moment you expose for the highlights and want the details back in the shadows you will introduce noise in the shadows, which degrading the quality of the image.
Always convert black and white afterwards. The reason why I am telling you this, is the fact that your camera can convert it in-camera but that makes just an average B/W. I personally prefer strong contrast in B/W so real black and real white in a B/W that makes the image stronger and more meaningful. So capture the scene in color and convert it to B/W in photoshop or in your favorite photo editor
try to shoot this kind of images with a tripod and start from f/16 as your apperture this gives you the best DoF.
This kind of images is pretty hard to shoot since there is a lot of light in the air and less on the ground. What you can do is make one with the lighting for the sky and one for the ground. Cross process them into one later. This will give you a very balanced image. In the old days this was done by using a ND grad filter, now you do this with Photoshop. If you like you can use the Gurushots post process service to give me the change to post process it for you
With kind regards