Thank you for your reply!
Let's confirm problems you mentioned one by one.
1. It's hard to describe but the bodice looks like it's a bit lumpy/the fabric is too thick. I've attached a picture of the part I mean.

-Could you please clarify it more? I do not understand what you mean. Thank you!
2. The bodice and skirt are slightly different color. It's not very noticeable in the far picture but it's definitely noticeable closer.

-Yes, bodice and skirt exist light color difference due to the different textures of fabrics. The skirt has white glitter fabric inside, it is more white than normal fabrics and it makes the skirt look more white. we will check how to to minish the color difference.
3. The space between the shoulder and neckline looks too small. I have a fairly long chest area so I'm worried it'll look too high up.

-It depends on the breast height you provided. It is 6.25 inch from shoulder seam to highest point of sweetheart neck.

-This dress is made to your exact measurements. Your size is different to our mannequin's size. This dress will look better on you than on our mannequin. If you still feel it too short, please provide the measurement from shoulder seam to highest point of sweetheart neck. We could alter it for you.

4. The sweetheart neckline is not as rounded as in picture 9, I wanted the dip to be slightly deeper.

-It is around 5.75 inch from hollow( center of your collar bone) to dip of sweetheart neck. If you want it deeper, please advise measurement from hollow( center of your collar bone) to dip of sweetheart neck.

-I am sorry that the picture does not show the sweetheart neckline perfectly. I take a picture to show the inside of this wedding dress. Please check it.

Thank you!