I think you did a pretty nice job given the available light. I really like the super wide angle shot shooting directly into the sun with the subject crossing in front of it. For this type of backlit exterior shot, you should be thinking of exposing more for the background and bouncing light back onto the subject. This would normally be done with a large diffusion frame with a reflective material stretched over it.
The size of the frame would depend on how wide your shot is, and therefore how far back the frame needs to be to stay out of the shot. You would generally use a 4x4' frame for a close up, 6x6' or 8x8' for a medium shot, and a 12x12' for a wide full-body shot.
Some common rags used for bounce lighting would be Ultrabounce, which is a white shiny tarp-like material with a black backing. Or Checkerboard which has alternating squares of white silk and silver or gold lame, which creates a mix of hard and soft shadows. You would use the Gold if you wanted a warmer bounce light. You can also use matte white material like Poly Silk or Bleached Muslin which will reflect less light but create a softer shadow. You can even used colored material like Day Blue Muslin to tint the bounce light with whatever color you desire.
For front lit subjects, you should diffuse the sunlight on the subject, which will also lower it's intensity to better match your background. You can use the same frames and use rags like Half Soft Frost, Poly Silk and Gridcloth to soften the shadows. I really like Half Soft Frost because it doesn't soften sunlight too much, just enough to make it pleasing. I've found this site to be a good resource for different types of rags: http://www.advantage...abric specs.htm
Of course, you can get fabric like bleached and unbleached muslin at any fabric store. I have a DP friend who made his own large diffusion roll out 'frames' out of yards of muslin stapled to 2x4 lumber. He uses them for low budget shoots when there aren't enough experienced grips to fly large rags safely (they can become huge sails in even mildly windy conditions).