I see the dust spots as well. I dont care for the first one much, she looks angry and the harsh shadow on the background is distracting.
I love the second one, very nice and the lighting is perfect.
The last one I like as well, I would suggest a reflector on the shadowed side of her face to bounce some light back on there and I would crop in a bit tighter.
Overall, nice work...especially for your first time, very impressive!