Having seen the pic, I don't think the original dress is doing you any favours. It looks fine, as you are tall and slim, but it's not not stunning and I don't think you feel stunning in it. If you like that look, I'd look at Monsoon on Vinted or Ebay or second hand wedding sites, because Monsoon have that more pared back flowing look, often not in bright white as well, just very simple.