When Takagi presents the image report of the current trend, what causes my image level/stats to go up/down after I'm done reading it?
Also, I'm trying to boost my dance stat with outfits and accessories, but I'm not getting improvement. All I can do is do lessons to raise it while I am able fluff up my other two stats. Any clue what's going on here? If it helps, I used a dance song for more than 9 weeks which I know I get penalties for using one for too long.

To boost your dance stat, I recommend wearing a Cool & Sexy outfit (or any Extend outfit, if you've bought DLC, that raises your dance stat) and a dance accessory, then for your remaining accessory slots balance it out with Vocal and Visual ones. It may take a small toll on your Vocal and Visual categories, but a few Vocal/Visual lessons will make it up, and it balances out all three of your stats. Image loss is typically due to using a song for too long, or if you make an appointment with a reporter but don't show up. It's also best to switch up the types of songs you use from time to time.