Good to see some personal work demonstrating a commitment to your learning.I think your tank needs a little extra detail though - its a bit smooth, and really needs some spare track links, chobham armour, that kind of thing to add interest... also front on is not the most dynamic pose.
http://www.armyrecognition.com/Amerique_du_nord/Etats_Unis/vehicules_lourds/M1_Abrams/M1A1_Abrams/M1_Abrams_USA_09.jpgI take it all back - this M1A1 has sod all of interest on the front plane... who knew!Still a more interesting pose than dead straight on though, doncha think?
ah yes, thanks v much i agree. Still figuring out how to tackle certain textures and surface qualities. Working a composition around a subject can be a pain too
oh and please leave more crits as i update i need the help T_T