Below is my attempt, using the same reference photo as you did. Honest critiques are welcome. This is only my third attempt at sculpting. My apologies for the poor photo quality and angle. I'm working with an android here.
I worked all day on this guy but I could not for the life of me figure out how to make him stand on his own. I destroyed a lot of detail trying to get him up right. That aside, it still was lots of fun.