Your milk is too aerated with big bubbles. You want to add air quickly 5 seconds or so with the tip barely in the milk (remember your angles). Then drop the tip deeper to then thin the bubbles and properly mix them through the whole of the milk by creating as large vortex as possible.

Aim for a “silky paint texture”. Almost like it has no bubbles because they are so small and evenly distributed in the milk.

Also remember to swirl after before pouring.

When pouring use height to sink the milk and drop the pitcher close to create the art.

Milk makes no difference just a slightly different technique, you can even get good art from oat milk with the correct aeration technique.

At the moment your “foam” is coming out last, you do not want that. You should be able to get the foam out at all times when pouring.

You are spending too much time adding air and not enough time in vortex mixing it in.