A shame about the size
The main issue that crops up here is the size of the image, which leaves us with something a lot less than it could be, since the thumbnails actually zoom in a lot more :(
Other than that, you've got a very nice looking drawing - detail levels seem great from this distance as does the shading. Please do get larger versions uploaded, as you're doing yourself a disservice, by not showing off your talents to the max.
Finally, a splash of colour would certainly enhance these pieces - did you draw them by hand or computer? If they're computer, the colour shouldn't be difficult at all.
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