Now theeeeeeere's a thing.... A term that I and a few painters I know use - but most 'know' it intuitively because it is what we all draw on all the time - in our minds eye - those times - those places - that person.
I'm not sure where the term came from -perhaps the S.American magic realists. When you do stuff from memory -you trust it as best you can -you 'hold' it - you believe it - like a bucket to the well.
It is coloured in all sorts of subconcious ways - it is magic memory - it is a distillation of your very particular experience and experiences - no one has the same magic memory of the same thing - but others will recognise your version - because the seeds are the same. Magic memory is also like a doodle - a thing to use. A thing to also encourage and practise in yourself when looking - check the big spaces, the main colour blocks, odd bits of informational detail - whatever you want - but as long as you conciously look and see, even say to yourself - 'I'll remember this' if you want - you've committed it to magic memory somewhere. When working from such memory, you have to be as bold and intuitive as you can - then more will come.