Yes, buckling all over the place.
Gouache on the left, transparent watercolor washes on the right. These should probably not see the light of day or assault your retinas, but each was fun, and good practice; on each one I allowed myself the freedom to experiment. (I never thought I'd ever crack open the gouache box again...but I'm reconsidering that!*)
*Thanks to Illustrator Brian Burgess and his revelation (to me, anyway) that they can dry and then be re-hydrated with a drop of water. This helped me out IMMENSELY. Brian, THANK YOU.