Deffinately the eyes for me. I alwayse over think them, should i make them bigger for more emotion? Should i make them smaller to look more realistic? Should i use angles or curves? anime' style, disney or realism? Why can't i seem to get them the same size ever? And pupil positioning on 3/4 veiw.

here are a couple 'how to draw hand' tutorials i found if anyone is interested

ttp://www.deviantart.com/deviation/35494492/
http://www.deviantart.com/deviation/37882731/