Burda 8360 Muslin

I absolutely love the style of this shirt. The collar and the center front seam caught my eye. I also love that the center front seam gives you options for closures. I made a muslin of the third view (View C) without any closure, and short sleeves.

(Picture compiled from pattern pictures on burdafashion.com)

My muslin, however, leaves a lot to be desired. I'm not sure which wrinkles/lines are acceptable and which ones are not. I think that I might have sloping shoulders, and thus have to lower the shoulders, but I'm not exactly sure. I also think I need to increase the size of the armhole, shorten the sleeve cap, and make the sleeve a little wider. And maybe I need to do (I'm dreading this) a Full bust adjustment? Again, I'm not completely certain. Part of me just wants to make this as-is and live with the imperfections, but I know if I can get the fit down, I will have a FABULOUS pattern that I can use over and over. I've taken a number of pictures, anyone have suggestions please?