Not bad at all. Some of the images are a little washed out (usually, calender images will have a slightly higher saturation, because humans usually prefer such images to be slightly over-saturated), but overall, very good. A couple of the poses are a little stiff, and yeah,the expressions perhaps a little "bland", but overall, very nice work.
I think my favorite is February (I think) - the girl sitting with her back towards you on the edge of the pool.
Also, the girl in the water is nicely done with the water-effect.