Maureen, my interaction with Evernote is a 'work in progress'. I like trying to figure out how to make things work for me, which might not be the best for you. I had a large collection of pattern scans in my iphoto collection. While I think I should have been able to drag those into Evernote directly, I was not able to do that so I exported the photo files to a new directory and then inserted each photo into a new note. Actually, I had two iphotos, one for the pattern front and one for the back, so both photos went into the same note. More recently, I have taken images directly from the pattern company website into a new note in Evernote. While you can select from a webpage and add that to Evernote, I found it easier to use a screen capture program, such as "Little Snapper" for my Mac, to capture the info I wanted and then drag that into a new Evernote note. I labelled each note with the pattern company and number, then tagged each note with items which might mean something to me - 'pants', 'easy', dress', 'designer name', etc. After you tag a pattern, that tag will be available for subsequent patterns. So, if I want to search for all of my 'Today's Fit' patterns, I enter that into the search. After working with it for awhile, I might find I need to do things differently.
This may not be at all what you were wanting to know and I may be able to help more if you are more specific. I use a Mac so my comments are from that perspective. While I have not done this, it looks like you can just hold your pattern up to your computer's camera and go from there. Also, I have the 'upgraded' version and I'm not sure how that differs from the free version, other than the amount of data you can upload per month.
I use Evernote to keep track of online purchases, shipment tracking numbers, online manuals, ideas which appeal - you name it. Feel free to pm if you think that is better.