This is such awesome design... I love the variation of the skin tones, to really make it seem like she has a "farmers tan". The headgear is a really neat idea, it gives a lot of storytelling in light of the rest of her attire. As far as the background, it's fine to leave it blank since it's more of a character study, but if you want to add a bit more to it perhaps add some settle textures. That would really pop her out. Keep up the good work!