Sweet photo, Alejandra. But, you asked for feedback, so I will tell you exactly how I feel about how you could improve it.
I think the model would look more comfortable in a simpler background. It does not seem to suit her wardrobe. It looks like a stable and the ground is wet.
Her hair is attractively styled, but it is blending in. And the flash on your camera is causing a little shine. If you like available light shoot early or late in the day when the sun is lower and the light is more flattering and you won't need the fill in flash.
You got a good response from your model, you just need to focus attention on her a little better and isolate her from the distractions.
Alejandra, you should have converted this image to RGB before posting. Some further adjustment with the levels or curve command would also give this a better tonal range.
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{K:163889} 8/6/2006