I really like the picture you have used in your overview section, however I am finding the key hard to read. I have found an article on Wikiversity on media, under images the article discusses how to reduce the size of images, I have attached the link to this article to this post. By following the instructions to reduce the size of image but using larger numbers, you can increase the size of this image, making the key readable.
Good luck with your book chapter.
Link to Wikiveristy page on media help
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Good focus on theory and some promising focus on research evidence
Maybe consider pros and cons of positive thinking - e.g., consider contrasting with the body of evidence and argument about "positive illusions" (e.g., Taylor) which suggests that some positive illusion is psychologically health.
Maybe also consider the Derek Sivers TED talk about not telling people your goals - because this can create a satisfaction that you've already achieved them and thereby reduce motivation
Consider adding case studies/examples to help make the topic more engaging
Conclusion provides a basic summary. Could be improved by providing more practical, take-away messages.
The Reeve (2015) textbook is overused as a citation - instead, utilise primary, peer-reviewed sources.
This chapter makes the common mistake of providing too much general background theoretical material about emotion and doesn't focus specifically enough, early enough on the target topic. Instead, summarise and link to further information about general background topics, to allow this chapter to focus on the specific topic. The start of the chapter, in terms of content that addresses the topic is the section "How can positive thinking lead to emotional problems?".
Basic coverage is provided of how PP might be problematic for emotional well-being.