Dealing with colleagues avoiding work
Try this: "Professor Smith, I'm glad we met the deadline, but I think I should tell you that I ended up doing all the work myself.  I had asked Bill to get up to speed on the drawing tool so that he could jump-start me when the time came, but he didn't.  Perhaps next time, you could ask us to develop a plan for partitioning work, which you would then approve."

You've let him know what happened.  More importantly, you've suggested a way to prevent such problems in the future.  It's a solution that doesn't require much of the professor's time, either.  (And, if the "approved plan" doesn't work, at that future time you could suggest progress reports from each team member.)