Experiment away. I might have to pull out my sketch books as well, but I definitely need a lot more practice in that area myself. I became really into the adult coloring books awhile ago and bought a whole suite of fancy colored pencils. It just goes to show me that some amazing things can come from markers and pen too as long as I am willing to experiment and step outside of the box. Again, wonderful image and I look forward to whatever you publish in the future! Hugs!!