Well, the foot was already pointed out but I noticed some other minor things. Fairly basic and easy to correct if they are noticed in time. One thing is the coloring on the flower, it feels like it stands out too much. Perhaps this is what you wanted...but its difficult to not look at it. With art its all about leading the eye from one thing to the next or having one specific area for perspective purposes...and that flower stands out too much. Color wise is FAR better then what I could hope to do (black and white...what can I say) but I did notice that the leg color seemed off...probably due to the dress' overshadow effect. The face was very well done, showing the emotion intended and the mask adds a nice feel to the image overall. But my biggest gripe is in the hand. Unless it is clenched/gripping it is off simply because of the finger width. Looks a bit chubby and odd otherwise.
But I gave you an eight and not a six or seven because for all its minor faults little touches (like the bottom of the dress, that little crease) that you place in certainly add flavor. Biggest thing of all is that it is not a boring picture, even for lack of a background or subtle perspective. Good job overall. Its not great, but its certainly a well-done picture overall.