TDK - Two vertices's have an edge between them, an edge loop is simply a segment of edges that makes a nice, smooth loop (ie. isnt interrupted by a pole)
Alucard - The model has definitely improved, geometry wise. Keep focused on making sure your edges are evenly separated, and take careful note of humanoid geometry. Your character appears to have no (or incredibly undeveloped) deltoids, which act as a fulcrum to life the arm, thus your character would have an awful hard time saying hello
Also, could you post your reference? When I think troll, I think tall and lanky, this character seems rather developed.
3D Game Art & Animation Major @ Champlain.edu
Maya | Photoshop | CrazyBump | Mudbox
Skiazo - 70 UD Rogue on WoW US Shattered Hand - Seeds of Despair 9/9 BT