This was a mixed bag for us, but that's to be expected when one book introduces a range of styles and artists. My son (6yo / 7yo when we worked through it) loved a few, was totally disinterested in others.
I found that trying to sit and read the text about the picture / artist didn't work particularly well for us, nor did thumbing through it. In the end, I put the open book on a small bookstand & left a two-page spread on display for a week or two. When I was ready to switch, I'd draw his attention to the new pic briefly and then just leave it to communicate on its own. I wasn't sure any of this was doing anything at all, until I noticed him imitating one of the styles in his free time. So -- not an Artist Study in any formalized sense, but I'm pleased enough.