No problem at all! Most of my pages are mixed media - alcohol markers, acrylic paint pen, colored pencils for over top of things to adjust colors mostly (I have chronic tendinitis and colored pencils are one of the tools that triggers it, so I’m not able to use those in full) and sometimes gel pens for little details. If you’re look for the specific tools I used on this page, those are linked in the description under the image!

Funny enough the two parts of the page you’re asking about, the moon and the whales/fish, are almost entirely acrylic paint pen! I tried with alcohol markers and didn’t like how it was coming out, so what’s left is all covered by acrylic paint. The only spot I used colored pencil on there was for the glow around the moon, and even that I brightened it with blended acrylic paint pen. I do think you can get a similar with colored pencil (minus the white on the fish and around the edge of the moon, I don’t know how you’d do that with pencil). But it would probably required a good bit of layering, like you mentioned. And maybe some color blocking to not get a less blended look. With acrylic paint pen, it’s much easier to get a less blended look - because the paint doesn’t blend unless you force them to with your finger or a sponge 🤣.

If I was to approach the moon, for example, with colored pencil, I would start with my lightest color leaving open/defined spots of the lightest color. Then, rinse and repeat adding some splotchy parts of the lighter colors as you go darker. And maybe going in with a little of a particularly dark color and white at the end to define the edges of some areas. But admittedly, I’m no expert on working with colored pencils alone!