Hello Aian,
The node is a get brush node that I have used the split pin feature on. You can do this by right clicking the pin and choosing “split pin”. This is also how I managed to get access to all of the other pins of the set brush node.
As for the image “cross”, this is simply just another texture that I am switching out to when I hover my mouse over a widget. In my example the green face texture in used as the default mouse. I then change the texture that is applied to the image widget (to cross when hovering) in the custom cursor blueprint.