I already talked a lot about this chapter on Twitter, but now that I read the translation and know all the little details in the conversation... My heart makes doki doki really hard imagining that maybe in the next chapter, among plenty of other things that I already supposed, we'll see Tomoko in the bathroom struggling about what to do with that make up.
I don't believe that she'll like what she sees, but criticizing or even removing it could hurt Katou and we all know that Tomoko wouldn't want that. And if she bears with it for Katou enduring the shame she fells... I need to prepare my heart to see that.
edit: almost forgot, I got the impression that Katou used that make up because it was one that was on the magazine and Tomoko and Nemo said that it was a type not like by the boys and Tomoko didn't like the idea of using make up to please boys. So, maybe Katou don't have bad taste, maybe she was just being considerate.