Good:
Nice start, still looks like this should be in the 25-35% stage, but nice start, still needs shading and depth and all that other stuff, good start though.
Bad:
The only thing I really have a problem with is the mapping with this sonic sensor thingy's, make them more oval like in the flat so that they could come out more circular.
overall: for a start 8/10
for actual head now 5/10