Will 470 g removed from G cup pendulous breasts leave me with a disproportionate result? (photo)

I find that a lot of women come in with misguided bra sizing.  From the looks of your picture, if you got properly fitted, I think you would be in the small D-cup range.  Every 160-180 grams is roughly one cup, so 470 grams would reduce you close to 3 cup sizes.  I think you would end up less than a B-cup which is way smaller than the "goal pictures" you provided.  The great thing is that you have beautiful breasts and should get an amazing result with just a lift or small reduction only (like in the neighborhood of 100-150 grams).  Unfortunately, insurance companies won't pay for this, but there are payment plans for cosmetic surgery that you can apply for.  Good luck and look at things on the bright side- your goals are absolutely attainable in the right hands.