I like the first one better.
Double post but it's done yet flawed. There's missing faces in P3D and I'm not sure what it means and I can't seem to fix it. Critique is still important btw.
If you're asking what faces are (which I doubt because that an awesome model, not sure how you could not know what faces are) they come under the same category as vertices or edges. Except faces are what are actually rendered, if there is no face it's invisible or non-existent. Vertices and edges make up faces.
It looks like there is misses faces on the hands,

It seems like there may be vertices or edges in that area, but a face has not been made there. If you're using blender, just select the edges and press F. If you're using something other than blender, just google it.
Or p3d is just being weird. :P