Do reference photos have to be the same size as my final drawing?
Do reference photos have to be the same size as my final drawing?
No.
Typically for individuals that begin learning to draw, they would start out in a grid method. To get a feel (muscle memory) where everything is proportionately going to be placed. Over time the hand and eye coordination will start to catch on over time. There are also other methods, such a projectors, or even tracing tables to help assist in large scale pieces of art.
Printers and tablets can be a good idea. It is common for artists to print out pieces of art, and grid on the printed piece of paper, to help with proportions as well.