Okay here's my sketch tutorial (which is also Levi's custom) as promised. it is a 5 step process.
Step 1: draw a wire frame for posing and as a representation of bone structure. remember the rules of proportionality here. from centermass to fingertip is always half the total height. males are always a 50/50 split. %50 above the waist, %50 below the waist. Females are a 40/60 split.
Step 2: draw anatomy- add musculature and body mass where needed and as appropriate. this is the point where u need to make sure that u have everything even and proportional. Also, this is where u add any gender specific anatomic structure.
Step 3: draw add ons- draw on anything extra at this point. Armor, helmets, weapons, kit, any accessories u may want to add at this point and anything in close proximity to the subject.
Step 4: line it out- using a black felt tip pen/marker, trace ur existing pencil sketch, tracing only the essential lines to cover what u need. then, take a big eraser to the whole sketch to make a clean picture. This step can also be accomplished in Photoshop or Gimp.
Step 5: add in any background u may choose, and color ur picture using quality fine tip coloring pens or one of the afforementioned photo editing software systems.
Oh... I forgot a crucial step!
Step 6: Share your art! Don't keep it to urself... that's just rude! Show people ur talent and let others enjoy ur work.
Congrats, u now have a successful mando sketch.
Kal