I am in the process of launching my first coloring book. I want to make a marketing plan for December since it is devised as a holiday present. I am looking for ideas of how and where to market this wonderful piece of art.
Build a parenting Social Twitter page, build it with follow/unfollow and interacting with other users. Post a link to your book on Reddit. Use Forums to promote your book. Q&A sites like Quora are also great.
Facebook is always good for paid traffic, however for this niche (coloring book), I can see it doing really well on Pinterest. Not sure how familiar you are with the platform, but they do have a paid advertising program. Pinterest is home to a lot of artsy types, and middle aged moms who eat this kind of stuff up. (DIY) etc.. I can see it being better received over there. Worth a try. Test everything, I say.