This one is not finished yet. I started it for my watercolor students for Cinco de Mayo. They painted similar things - one did margaritas in different glasses and one did a mix of fruit and both will finish their paintings next class (my class only meets every other Tuesday so they have time to work on their projects in between or start another painting, using the things they learned in class, etc.)
The way I started my Cinco de Mayo painting was:
Using Daniel Smith Watercolor Ground as a texture medium, I dabbed with a round brush around the tops of the glasses to imitate the salt.
I painted the background using Daniel Smith Moonglow, cutting around everything.
Next, the fruit.
Then the margaritas and fruit in the glasses.
To finish this, I'd have to do the apple slice and work a bit on the lime slice. Plus, I'd have to cut around the salted edges to make them look better.