I only have access to this image of yours, and by zooming in even more without losing the pixelated quality, I notice that the mimicry of the snow mountain with the snow terrain is excellent.

Very ultra please make some clouds for this style. They will look wonderful between the mountain bases along with tree icons, buildings etc. (Cloud, fog and low clouds)

If I want something more realistic, I would definitely go for Forest or Winter Trail (or both), something more "cartoon" certainly Mike Schley who has even more icons for variations.

In this zoom, the base of the mountain looks very interesting, with this design that gives a "fade/fog" sensation.

I really like the soft blue tone of the snow, from there to white.

Looking forward to super maximizing these icons! 🤘

Congratulations on your effort, Sue!

p.s.: Whenever you are going to make a "multi level landscape" keep in mind that darker colors usually give the impression of lower parts, and lighter colors give the impression of higher regions.

Perhaps working with the drawing vertically will help the sensation of depth more, since you can change the mountains behind them on the X and Y axis.

A little bit of clouds always helps with the sensation of Landscape.

In the right corner of the table, the mesa line is crossing the cliff, you can put the cliff in front of the mesa (if they are on the same sheet) or even use trees to hide this irregularity (normally one of my most used resources for imperfections).