I feel communities can be put in 3 categories.

1. Everything here is safe for work

2. Things here are not safe for work, e.g. adult communities. There might be a bit of safe for work, but anyone browsing it knows what to expect

3. The third is a combination. It might have a community rule that anything NSFW is tagged as such. With my browsing setup I have to click on NSFW posts to reveal them.

I’d have a look around for an art sharing community. I think theres one on world and they might allow NSFW content and people would be more likely to give you relevant feedback.