The above sketches were drawn digitally with Sketchbook Pro following along with some of the exercises in Charles Bernard's Figure Trek video (part 7). The top sketch started off as a simple proportion drawing 8 heads high using Andrew Loomis's 'Drawing for all it's Worth' book which is widely available on the internet in a pdf format. I drew the basic figure first then added a more muscle definition before finally adding the costume on top.
It's an approach that Charles Bernard uses to great effect and I'm looking forward to using it with more expressive poses.