I need some advice as to how much a dress can be altered. I have some time until my wedding but I wanted some honest advice from people who aren't trying to sell me something. Opinions on the dress I currently have would be welcome (pics below) along with any advice on alterations that can be done.
I bought a wedding dress about 4 years ago (I was 18, it was $100's, and I'm an impulsive shopper). Anyways, I love the detailing on the neckline and the train (aside from wanting it a little darker/less subtle), but feel the rest of the dress is too plain. Of all the dresses I have looked at and like recently they have more layers of fabric, a more defined waist, more volume in the skirt (which I know I could achieve in the dress I currently have with a slip), and more embelishments.
So I guess my question is how much can I change the dress I currently have, keeping the detailing already there, but also adding some other elements to make it more special and less subtle. TIA!
Detail on the neckline and train

Front of the dress

Back of the dress
