Fit Issues: What do you think?

Remember the first dress I made?  I've been looking back at some of the pictures and realised there may be a fit issue (or several) but not quite sure how to remedy it.  I am hoping some of you with more sewing experience can help give me some advice!

Here's me in the dress without a belt:

 

  

Notice the wrinkles in the bodice?  Also how it is fairly low cut for a 40's/50's dress?  I am wondering if I need to take it in or take the bodice up at the shoulders??

I also still need to hem the dress (maybe up 2 inches or so??)

Also, I don't know if I did the collar right...Here's the original pattern:

  

The pattern says it's a 'stand-up' collar.  I am wondering if my interfacing is too heavy?  Or I didn't sew enough of the collar into the neck of the dress?  Or is it just an issue of ironing to roll a bit more?

Lastly, here is the back (note: I am wearing a belt):

 

Again, there is an issue fit with the bodice that I think is affecting both the front and the back.  What do you think?  Do I need to put a dart somewhere?  Take it in or up?

Also notice how the winged cuffs are a bit droopy...interface too heavy?  Thoughts on that?  Should I take the sleeves up a bit too so that the cuff sit higher up?

Thanks everyone!