Spacey Sketchbook Cover Progress

I’m participating in The Sketchbook Project this year and here is the cover in progress.

Trying to incorporate a current trend with the moon gradient. Anyone have tips for blending gradients with Prisma Colors? It’s was really difficult to blend because the texture is so rough.

The white lines and shapes are inspired by a vintage book I found at a thrift shop (I love old print!)

Anyway, I’m liking it so far. What do you think? What can I do to make it better?