This is wonderful news! I am happy for you. Being asked is an honor, for sure. And especially at a place that you like or admire ( in style).
Your friends are probably teasing you, or they just don't know. You have a personal style already, and have improved over time. If this is something you want to dive further into, it looks like you are getting a good offer/prompting to do so.
Keep building your portfolio. It is the framing for such things that can be the most expensive, I have heard.
From where you were when you posted your first poem in Beginner's you have grown artistically and it has been a pleasure to watch. Well done, Mic.
(I am determined to find a painting class next September, I have even arranged my work schedule already! You've been an inspiration)