The mistakes were made before you laid in your values! Note how in the video, Stan has a simple/preliminary drawing, utilizing the envelope method to determine the proportions of the parts of the pose in relation to each other. He hasn't taken it to finish yet because he wants to make sure he got it right before spending time on the tertiary details, like defining specific muscle groups and adding values. At this stage, it's relatively painless to move things around because you haven't spent a lot of time making it look pretty. It's a good practice to get into to check measurements at this stage.