Some very nice fill-the-frame minimalism here! So much is conveyed about who she is from the most minimal view possible, exactly what Minimalism is all about. 9
Normally a centered subject is frowned upon but the centered heart works here with the arc of the necklace giving a good dynamic element and just the hint of the neck giving the perspective. Nice job.
there are three things that aren't good in this photo. the simetry isn't perfect, I think that the composition was good if both the upper corners was filled. the colours are flat and the focus isn't perfect