Hi Anastasiia,
I suspect that for veteran Wikipedians, this message and encouragement is not needed, but for new contributors it may help. However, they would require a bit more guidance. If I were a new contributor, and saw such a message, I would have a few different questions:
- How do I find 'relevant articles and lists'
- How do I physically add photos
- How do I know if it is appropriate to add my own photo (e.g. if there's already two photos, and I think that mine is much better... ?)
How about putting together a small blog post or help page with some instructions?
Best,
Lodewijk