I like the details on this. I don't know how much of what is here was you vs the source for the pictures, but I feel like her initial expression is that perfect blend of confused/scared for an impending chestburster delivery, and the second has a good amount of shock/pain. The blood addition seems fairly natural, though the photoshopping of the actual alien itself could use a bit of work, the brightness on it needs to be dimmed to better match the actress, though the cropping of the edges of it seems pretty solid, none of that telltale whiteness around the outside.
All said, a really solid effort! I enjoyed this piece, I would love to see more of this nature from you! I hope my observations don't come off as too hostile or disparaging.