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Copy the existing display template: go to https://your-server/_catalogs/masterpage/Forms/AllItems.aspx copy Item_Person.html and rename it After this, open your copied file and check whether uPicUrl is empty. If yes, provide it with your default URL. Now, you have to create new Result type. Go to Site settings -> Search -> Result types. Find 'Person' ...
Copy the out of the box Display Template, rename it and upload it back to SharePoint. Edit the Display Template to point to your desired image. There are many answers to this process here in SE as well as blog posts on the topic. You just have to create a new Display Template.
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