Here is my contribution on the topic. I use evernote a lot to take downs notes, or to organise ideas in my head. When i need to resize a picture in my notes, i will copy and paste it onto MS Powerpoint. Re-size it by dragging the edges, before pasting it back into evernote again. This is the fast method i have found so far. Might take some trial and error to get the perfect size you are looking for.