Finally, market your available photos. Get active in photography forums, social networks, guest posting about photography will help you a lot. You probably aren’t going to get rich selling photos online, but you can earn some extra cash passively.  Say you earn $1 per month for every image listed and if you have 50 images available for sale, you may be earning around $50 per month.
FYI – If you’re already a blogger and want some solid ways to increase income from posts and products you already have, I highly recommend snagging a copy of Income Boost. It’s a quick read and will boil down some of my favorite income producing methods into exactly what you need to implement like right now for instant cash. You can use the coupon code “GET5” during checkout to receive $5 off the purchase price.
Shane and Jocelyn Sams, who were teachers before. Shane listened to my podcast, and he was like, check out this guy Pat, and his wife was like, No, that sounds kind of scammy to me. But then they decided to give creating digital products a try, so Jocelyn created a website called Elementary Librarian where she was selling packages and worksheets to librarians to help them and that site is doing really well. And Shane is a football coach, so he created to sell defensive plays to coaches. Both of those are doing well over six figures a month now, and they’re doing it through pdf files, worksheets and tools that their audience can use to help them in a more convenient way.
One absolute valuation method which may not be so familiar to most, but is widely used by analysts is the residual income method. In this article, we will introduce you to the underlying basics behind the residual income model and how it can be used to place an absolute value on a firm. (The DDM is one of the most foundational of financial theories, but it's only as good as its assumptions. Check out Digging Into The Dividend Discount Model.)

Another popular online passive income strategy is to write an ebook. Then you just need to build a website for it and watch as the money rolls in with each purchase. You only have to do the work upfront and then you just sit back and enjoy notifications from PayPal as more moolah hits your account. This is often touted as one of the best ways to earn a passive income online.

Affiliate marketing spins around having readers click on the links in your articles and then subsequently purchasing the products you were writing about. Once they click the link in your article and then buy the product, you get a piece of the pie through commission. Commission varies among companies, but usually it is anywhere between 2% up to 10%.
(Of course, you can also always get passive income by buying-and-holding US Treasuries, which are paying out around 4.2%. The BLS just reported inflation at 3.6%. No one's going to get rich with that level of passive income net of inflation. And according to Shadow Government Statistics, the real rate of inflation you and I are actually experiencing---including at the grocery store checkout line, at the gas pump, and at the doctor's office---not the massaged statistics the government puts out, is actually much higher, perhaps up to 11%. So government bonds could actually be not passive income---however meager---but passive losses.)
There is no short cut to success. There is however a difference to the efficiency and methods you use to develop your ideal personal economics. Take a moment to look around and you will see countless people all working in their own way. Who is successful depends on their financial goals and if they are achieving them. What works for them may not specifically work for you.
PPS oh you thought I was done did you?!  The other parts of the book, although not truly passive income generation focused, are amazing too.  I know things like the low information diet and killing interruptions have made a huge difference to my success – and if I can try and get a little more consistency in my adherence to them, then happy freaking days!