I've installed elementary OS on my pc and I need of PhotoShop (I like create layout site with PhotoShop). Can I install PhotoShop on elementary OS without virtual box?
You can have Photoshop CS6 on elementaryOS with PlayOnLinux : https://www.playonlinux.com/en/app-2316-Adobe_Photoshop_CS6.html
First install PlayOnLinux https://www.playonlinux.com/en/download.html#pres_item6, follow the instructions in the Ubuntu Trusty Category.
Then open PlayOnLinux and click the button "Install", then search for "photoshop" and follow the instructions !
Screens from my computer :