when you are sewing your ribbon make sure you have 3 folds in the center when you pull the ribbon tight also you have to kind of shape the ribbon before you sew it. Kind of like a swerving cross. It takes alot of practice to get it right. It took me a month of practice to learn it and get it down. There is a free tutorial around here somewhere ill see if i can find it....here is one Boutique Bow Free Instructions
not the one i was looking for but this one helped me.