Stretch paper properly for water colours. The crinkles that happen when unstreched paper dries look worse once framed.

Choose mounts that gently complement your work not "argue against it."

Make sure your frames are sturdy and have the right sort of hangings for the exhibition you are showing in. (SAS use hooks and picture wire in some venues, others require mirror mounts.)

Make sure the label is readable, the price is right and it is secured as instructed.

Finally, enjoy your work as it is exhibited.