When you write a blog you are publishing for the world to see and it’s important you be aware of potential issues which may arise from what you have written. It is your responsibility to protect yourself from legal issues such as breach of copyright or defamatory text. You cannot make accusations you cannot backup with evidence.
Images you upload must be your own or you must have the copyright owners permission before using it. A very good site for free images is Pixabay (http://pixabay.com) and I suggest you use it to illustrate your blog, or use photographs you have taken yourself. When posting images or other artwork it is important to give appropriate credit.
The link below contains some useful information regarding legal issues, please take a few minutes to read through it and familiarise yourself with the basics.
Never forget that ignorance is not a defence in the eyes of the law.