See if this anatomy guide helps, one thing I notice is it might be easier to figure out proportions if you remove that hat. You need to think about the forms underneath the clothing if you really want to sell this guy. This page is from Andrew Loomis, all of his books can be found online, as they are out of print.
Thanks for all the replies guys, it really helps. @MightyPea - I'll keep that in mind for the future but I'm glad I posted this one so soon because I learned some invaluable stuff about using refs and male proportions thanks to you guys :D @Progg - lmao, but its sad because its true.. and I didn't even notice just how bad…