Found a few videos of Ana Vidovic giving a masterclass. Worth watching. She seems big on experimenting with tonal color, but there’s not a lot of helpful advice about how to do that. That said, she does mention that phrases should, in her opinion, have a consistent sound. Sort of a hint at how the structure of a piece can help one experiment with tonal color.
Some other things stand out. Prepare and sequence left hand fingers and always think ahead of your hands. Play chords more connected; think about music in terms of lines, in other words (though she doesn’t say that).