Have some old "Mexican chairs" that are probably pine. My wife wanted to paint them in various colors and primed them with an oil based primer some time ago. Now she is thinking milk paint would have been nice. Milk paint doesn't need a primer right? Could this work, or is it a bad idea to put milk paint over an oil based primer?

Overall, if you look at these pics (minus the artwork), what kind of paint do you think would get these kind of results? Kind of a flat finish, uneven... thanks in advanced.