2 beautiful mockup for your presentation. Buy full version from here: https://gumroad.com/l/iphonexui
Resolution: 1600x1200 for dribbble and 1600x1200 social network posts.
Screen placements for iphone X (iphone 8 available on Full version). Very easy to use.
Currently, it's only available for Sketch, XD version will available soon).
Enjoy the Mockup.