Hi David! I love these concepts! If I may, I'd like to add a counter-point to Shelvs' suggestion here. I think that advice is great if you're just starting out and brainstorming concepts! I just don't think it's the right move to make in this case. It's pretty clear in these concepts so far that you're going for realism. So, I'd say really lean into that to push things further. I love that your notes already show some ideas on how these things grow and spread spores. And there's one that's been noted to be really toxic to breathe in. So maybe think more about the environments these grow in -- how do their environments factor into how they grow and reproduce? How bad can they get? Are the overpopulated in their respective environments or sparse? Are they parasitic? And most importantly, how are they dangerous to humans and how do their environments contribute to that? Those are some starting points to think about. Maybe in later iterations, you make speed paints/quick illustrations of these fungi in their respective environments that explores these questions and how they affects humans and wildlife! And play around with scale!! Hope this helps with your creative direction! Happy designing! 🥰

Honestly this is some great advice, thankyou so much for taking the time. And thanks for the sketch, your awesome :)

Think major shapes then details