I like the ensemble, but I'd say the face, daffodils and guitar look a bit too different from the initial style you wanted to use. Again, I see it is a homage you wanted to do, so I can understand you did not exactly want to copy it, but I think those parts I mentionned earlier do not exactly fit in there.
Other than that, I love the expression on the woman's face, and the "hippie / 60s" feeling that comes out of your work
You're welcome! Art Nouveau, especially Mucha, is my favourite art style, but I've never really been able to capture it well enough for my liking (considering the lack of anything in my gallery in that style, lol), So I'm envious of what a great job you did.
Pretty cool, I love Mucha! The flowers with the guitars is a neat idea and fits in well as a band poster. The color scheme works too. I'm digging the detail in her face but more detail in the hair seems necessary to tie it all together. The face, as well as the detail in the flowers work the best, they stand out against the background the most.