Assess the field: it is likely you will have a few favorable matches available, and some of them can create power-ups. Use these power-ups to destroy the boxes and open the water lilies. Remember that once you open a lily halfway, you must make another match or an explosion nearby to open it fully, otherwise it’ll close again.
Don’t get distracted with collecting the extra moves — they’ll likely be collected by auto-matches and power-up explosions. Combine your power-ups by exploding them together, as it will help you charge your Rainbow Blast faster, clear the path to the statues and collect them as well. A match of two Rainbow Blasts will be highly efficient on this level.