About the demo images, as we’ve noted in the theme description on Themeforest.
Due to the image copyrights, (like other premium themes on ThemeForest) the demo images used on our demo sites are not included in the theme package and will be replaced by sample gray images. Please simply change it to your own images instead.
If you want actual images, you may need buy it from the image owner, or search and use royalty-free pictures as you wish. I can recommend you some of good quality free images in 2 sites here: https://www.pexels.com/ and https://unsplash.com/
For your information, we use the gray images to demonstrate the layout only (please understand that we’re selling theme with functions, demo layout & support, but not selling images since we aren’t the image owner). Also, using gray sample images can help to reduce the time of importing demo content (which is really important because in many hosting, the script process time is limited). And many other authors use the same way as us. So please simply change those sample images to your own images instead.
I hope this answers your question, and if you need anything else, please let us know.