Two things play a major role for someone to even start reading a post.
1. Title2. Image
Pictures are important. Photos, images, illustrations, graphics- they all bring attention to a post. They spark the interest in the reader to go ahead and read the post. In fact, even before we look at the title, we look at the image associated with the post. Our eyes naturally fall first on the picture and then move up to see the title. That is why it is essential to have a catchy title, and also a catchy photograph.
Photos can be funny, moving, informative, descriptive, beautiful, and much more- and each of these type of pictures have their own role and contribution. What type of picture you choose for your post will also influence the tone with which the reader will look at what you have written. For example, for a serious subject, a funny cartoon might tone it down a bit. If that is the intention, then it is one of the greatest tools to put a subtler impression on your readers. But, if it is not the intention to make it more subtle, then a funny picture can actually derail the whole tone of your article/post. The other way round is also true. A very serious picture for a funny/humorous post can make the reader confused about whether the writing was actually meant to be funny. Long point short: pictures speak a lot more to our subconscious minds than we care to notice.
There are many resources today for finding pictures. One must always be careful of the credits that go to the picture. Also, not all pictures can be freely edited or modified. Some pictures are allowed for reuse while some others are not. Some are allowed for reuse with credits while some others can be reused freely without crediting or linking back to the artist. Some pictures are allowed to be modified while some are not. So, one has to check these things before using photos digitally.
We all search on the web and just insert photos from there without thinking. A good way to filter pictures on Google according to your preferences is to use the "Tools" under Google Images where you can filter pictures according to the user rights enabled for them.
This is especially useful for all students who use images for projects, and also bloggers like me who constantly look for good pictures for articles and posts. I learnt of this pretty recently, and thought I should share it (just in case someone didn't know about it- like me)!
Pictures brighten up your post, and you should definitely use them to your advantage! But always give credit where you can (even if the image doesn't need credit)! Happy writing!