This is an article on getting your images to the correct size and sharpness for Usefilm. It will let us see you images better and give you more in depth critiques.
I enlarged your image in PS, but I think some of the quality got lost from me doing it, but here is what I think you can look for next time: The cliff of the left side of the screen is parallel to the background cliffs, blending it in too much and taking away the impact of the canyon. Try a different vantage point to get lower and make that cliff stand out from everything else. This will make your image have a major point of focus. The colour looks pretty good for 400 ISO film, but if you want more saturated colours and less grain (in case you ever want to enlarge these!) try going with 200 ISO or slower. Can't wait to see more! And welcome to Usefilm!
First suggestion (which, I confess, is selfishly motivated) is to use larger images, if you can stand the upload times. It will be easier for the folks on this site to help with their critiques if they can see as large an image as you can post.
Another suggestion I would recommend is doing a google search "photography composition tips". There are quite a few helpful websites out there that explain the basics of photo composition. I'm new to serious photography, too, and I've found http://www.kodak.com/global/en/consumer/education/programs/composition/photoProgramCompMain.shtml to be pretty helpful, but there are other sites as well.
I recommend this only because the only thing I can tell about this uploaded image is that your horizon is straight across the middle of the frame which is generally not recommended.
Geez, I sound like a know-it-all and a rambling one at that. Just trying to help.
Once again, welcome to USEFILM! Glad to have you with us.