I think this probably should be in the promotional section, as openly advertising your services in a new thread is not the best way to go about introducing yourself to a forum, especially when you haven't written an introductory post yet. It just feels like spam from the get-go.
I've still promoted a few of my things outside of the promotional section, but I did it because it was relevant to someone's actual current issue in a different thread, and I knew that my tutorial videos already covered concepts that might solve their current problem.