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Ah, ah ! Thanks @delishtreats :)

Actually, I know I've struggled to get the best I could with what I knew about painting at this time.
Now I look at it, I also see some bad start choices (support, medium) that will make it hard to progress in the direction it could go.

That's both frustrating and thrilling : there's a problem to solve, and obviously, I still can't identify it, which is a motor to test new weird stuff and learn...
But... I'm not sure the chaos bird will survive the experience :D