For the times your client gives you a quick turn around time you'll want to adopt some quick workflow habits so you can increase your efficiency and hourly rate if you work on a per project fee.
In this video I teach you a few of my tricks:
Access to my client questionnaire
A free website that acts like a giant post-it note board
Batch labelling and organizing
Creating keyboard shortcuts in Adobe Photoshop
The best method to send a high volume of deliverables to the client
What app to use to easily send an invoice