Welcome to
Good start to a sketchbook. Awesome stuff so far. Really liking the colors in each piece.
If you don't mind a little critique, the bottom one seems a bit on the monochromatic side. I would say try adding a bit more color other than the yellow an orange coming from the fire. Also the humans or explorers, they blend into the background a bit. I think the composition is good though. Just a few tweaks can be made to the colors. Other than that awesome start and I look forward to seeing more of your work.