As this is a WIP it is difficult for me to see how far you want to take this piece. The colors at this point are flat with no shading or interesting highlights. Establish a light source, and then add the shadows and varied values. Tears would appear as more of a very light gray or white and not blue and try to mix up the background a bit so that it is not so flat. I hope you find this of some help, good luck.
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