to r3n: i use faber castell's and derwent's which are pretty good pencils.
to psj: keep in mind these are not supposed to be realistic, the only realistic sketch is the 2Pac one, for the mech, i was trying to do my own thing off the top of my head, i dont like to try and copy another artist's work because then its theirs not your own, even if its great stuff like gundam (which ive never seen but hope to get around and watching)
ive got some pic projects in class im working on which ill hopefully post.