When it comes to flower painting, there’s an advantage to concentrating, initially at least, on a single species and it reduces the choice of shapes and colours that the subject otherwise presents. However, I fear that this book may be going to fall between those who don’t want to paint irises and those who don’t want to be restricted by a single species, which is a shame.
On the whole, this is nicely done and there’s a great deal you can learn in terms of shading and detail work, as irises are complex flowers that repay a great deal of study. I do slightly worry, though, that the finished paintings look just a little flat, suggesting a lack of modelling which is one of the things you’d want to be learning.