Of Course you can advertise your website/blog's image. You can use a combination of the previous suggestions or you can use a very compelling image that you feel would fit for a particular audience. You can advertise for brand awareness and for clicks to your website.

Remember: These suggestions are catered towards brand awareness primarily on Facebook. If something is working for you, keep doing it. You can use some of these methods modestly as you get used to advertising and promoting on Facebook. You can also be as creative as you want with these methods. This is just to steer you towards some general ideas.