How to change image icon of service in front page?

Hi, Thanks for your themes and I loving it very much!! May I know how to change the icon image of services in front page and the image in service page? Because I saw the demo page is different between front page and service page, but I can only set both of them to the same image. Thank you very much!! example: https://sherpashk.com/wp-content/uploads/2019/02/ScreenHunter_2054-Feb.-11-00.37.jpg https://sherpashk.com/wp-content/uploads/2019/02/ScreenHunter_2056-Feb.-11-00.38.jpg