>>76895884For intermissions that introduce new characters, it helps to use a scene that gives the reader a little bit of knowledge about them, and it can be something unrelated to the thing you're going to foreshadow. If you write them doing a seemingly insignificant task, the way they carry themselves in performing it can help to paint that picture for a reader. If you are going for a conflict orchestrator kind of thing, they don't have to do anything more than show that they're putting their pieces onto the board and making their move. Like they just finished up prepping what they need to kick off their plan, or maybe even finalizing the details of the plan itself. Make the intermission more about the character itself than the plot points that come with them. Those will reveal themselves in time, make your reader intrigued over this mystery dude and the role they will come to play.
If it makes you feel better, emailing someone to take a look at your work only requires slightly more courage than posting your work for anyone to see. You're pretty much there, and like others have said, the readers on that list are there to help. The worst they can say is no, right? Right?!