The antennas need a base to extrude from i think, also this model looks very angular, I am all for low polies (infact I live by them) but this looks too low for this model in my opinion. Unless your planning a mod for a Gameboy DSI or summat like that.
Its a good start, and its nice to see you can texture and map also, I look forward to seeing how you progress this further. good luck ;)