I was quite taken by this picture. The face (especially the eyes) is very expressive, and the choice of pose just wonderful. I like the contrast between an outfit that symboizes great faith and the crossing of the fingers (not sure if that’s the feel it was meant to convey, but that’s where I went with it :-).
In terms of critique (all minor stuff):
I noticed some pixel issues to either side of the eyes, both where the white part of her habit meets the face and then again to the left where the black part of the habit meets the red background. This gives away the CG origins of the picture, but should be easily fixed, I think.
I also note that the lower part of the clothing under her chin is wrinkled a bit and looks more worn in, which gives a certain impresison of her, but then at the top of her head and to some extent the sides as well it’s ultra smooth, which I would agree is part of how they appear but was still in contrast to the lower part (i.e. very stiff and smooth). So for me there seemed a disconnect between the two. Consider either wrinkling the top and side parts slightly (that would be my choice; I think it adds to her character), or maybe smoothing out the lower part a bit more.
The background also felt too ‘uniform’ in colouor, again betraying the CG origins. Perhaps try for a more mottled background that breaks things up a bit. From what I can see accomplished on the rest of the picture, that shouldn’t be too much of a stretch 
Overall a nice piece. Keep up the good work.
