Yes you can indeed, but it's good to remember that there are limitations when it comes to commercial use of Unsplash images, like as the cover of book.
Note that the Unsplash License does not include the right to use:
- Trademarks, logos, or brands that appear in Photos
- People’s images if they are recognizable in the Photos
- Works of art or authorship that appear in Photos
If you download photos with any of these depicted in them, you may need the permission of the brand owner of the brand or work of authorship or individual depending on how you use the Photo. Please review our License for more information and, if you still aren’t sure, you should probably talk to a lawyer who knows about these things.