Oh wow I was blown away by this! This is great! I'm not really a sewing heavy cosplayer so I really shouldn't talk too much about construction of the dress itself though.
Only two things I think could help is to iron the dress thoroughly, since the wrinkles on your crosses were apparent, but I'd imagine there might be some sort of boning in there that prevents that yeah?
Possible the bangs on the wig could be cut a little shorter.
But to be perfectly honest it's really just nitpicking. This is pretty much spot on. Fabric choice, construction and makeup all came together for a great cos!