Better quantity approximation - user generated comparison pictures?

Hi,

I don't have scales, and I am not familiar with oz, fl oz, cups, etc.
I think it would be great to have a user-generated feature where you can post a photo of what, for instance, 100g of coriander, or a 500g aubergine looks like, and others can easily estimate the amount they have in front of them or previously ate.

Also more clarity on whether a food weight is for the dry or cooked weight would be great.

And a note about vitamin D and sunlight, time of year, skin colours, etc would be nice.

What do you guys think about these ideas?