I think the silhouette is generally good. I do however think the holes are a little too soft. I've provided a reference below (sorry i'm on dota atm, otherwise i'd highlight it out) You may want to add a little bit more attention around the holes, just so they aren't too soft! Otherwise great work
The renders are not very helpful, try to setup the lighting and the materials so you have a nice specular highlight going in the visible part of the model. Note: The screenshot of the model is not mine, i just made a quick google search and it led me to that, but its a very good example Heres you can find some more information : http://wiki.polycount.com/wiki/Model_Presentation
, more images here - 
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You may want to add a little bit more attention around the holes, just so they aren't too soft! Otherwise great work
Heres you can find some more information : http://wiki.polycount.com/wiki/Model_Presentation