You can tell that you study orchestration because you have a good ability to write for orchestra. Writing for symphonic ensembles is always a bit more complex, but I don't think it's necessary. Your type of ensemble works precisely because it's smaller, in my opinion. Consider it as an exercise; if you have the time, I would suggest experimenting (even if you don't have to publish it) with winds in addition to what you've written. I think it could work 😊