If the audio file has picture information, you will see the picture of the CD cover after syncing it to the iPhone. If you want to make your own music CD cover, you can follow the steps below:

1. Download the CD album cover, the size is preferably 230*230;

2. Import the audio file to iTunes library;

3. Click "Music" in the library, then right-click on the song name and select "Show Introduction";

4. In the opened "Show Introduction" In the dialog box, select "Illustrations", then click "Add (a)", select your CD album cover picture file on the computer, and press "OK";

5. Sync music to iPhone ;

6. On the iPhone, open the iPod player and you can see the CD album cover of the song.