If I delete Google account entirely will it delete all the photos saved on my phone? I want to delete my present google account, entirely, but I'm unsure as to whether doing so would delete all the apps on my phone, and all the pictures I've saved, from the Internet and screenshots and being sent them etc.
This link about deleting google account gives you the required information. 

As far as I understand, it would not delete the apps and screenshots from your phone.