Oh, I love this! The salt trick is tricky...it took me two times to get it right (two separate trials on two separate pieces I did)
Anyway, great job with the watercolour; it's fantastic!
And, what I did was I took my paper and a wet brush (with no paint on it) and washed the paper where I wanted the salt to be. Then I painted the paper wet-on-wet and quickly sprinkled the salt onto it. After a few minutes I dusted the salt off and there were little snowflake-like marks where the salt grains had been