Retain some control. If you upload photos of yourself, or friends/family with consent, it's worth going for the 'rights managed' licence option – otherwise you'll have little to no control over how your images are used (eg, you could star in an ad for haemorrhoid cream). See Alamy's page on understanding stock image licensing for more on the different types of licences.
In the case of cost per mille/click, the publisher is not concerned about whether a visitor is a member of the audience that the advertiser tries to attract and is able to convert, because at this point the publisher has already earned his commission. This leaves the greater, and, in case of cost per mille, the full risk and loss (if the visitor cannot be converted) to the advertiser.
If you wish you had a little more money in your pocket, you’re not alone. Fortunately, you have a variety of options when it comes to making money. Doing odd jobs is a quick and easy way to earn money. Similarly, reselling items or selling items you make can earn you extra cash. As another option, earn money online by writing a blog, freelancing, or doing online surveys.