I want to do photography and configure an Apple notebook, which is more cost-effective?

Apple's best notebook now is 20 12 Macbook Pro with Retina display.

You can go to Apple's website. It can be configured by itself.

Most of the design software is on the Mac. There are many professional-grade softwares used by designers in the MacAppStore. Don't worry.

As for the size, it depends on personal preference. Available in 13 inch and 15 inch.

Note that the Pro I'm talking about is the retina screen, not the traditional Pro.

The performance of the Air is also very good, and it is completely competent for the work, but it is mainly light. You can go to the Apple Store to experience this before making a decision. Then, if you like photography, you can go to official website to see some Apple notebooks that are helpful for photography. They also have a good performance and are fully qualified for this job, but the most important thing is to kiss all over the body, and then you can ask for that kind of retina screen, which is not a traditional laptop, and you can tend to take pictures.