Mixing acrylic paints with a palette knife

I have a set of plastic palette knifes which I bought years ago. I haven't used them much - whenever I tried to use them I had the impression that I was doing it the wrong way, and so I stopped. In addition to that I have been using acrylic inks mostly, and mixing them was fine whenever I used the brush to mix. 

However a few days ago I was looking at my collection of acrylic paint tubes (all kind of brands, some heavy body, some soft body, some craft paints) and thought that maybe using a palette knife for color mixing and flattening out the blob of paint could help me with doing a detailed painting even with acrylic tube paints. I watched some videos on YouTube, and then I took my heart into my hands andpa tried it myself. You can see the result in the painting above: The various shades of grey were done with mixing a grey craft paint with a white no namer by using a paöette knife. Of course I need a lot more practice, but I feel that I am on the right way.

In addition to that I tried another new thing: I added some strokes with watercolor brush pens on top of the acrylic painting.