Can a better LinkedIn profile photo improve my job search?

The evidence would strongly suggest that yes it will help you since 90%+ of hiring managers use LinkedIn to find and vet job candidates. In addition, LinkedIn states :”Members with a profile photo on LinkedIn can get up to 21 times more profile views than members without. Get noticed! Find tips for improving your professional image with a profile photo, along with details on background photos, visibility settings, and more.

So paying attention to tthe first thing that a recruiter, hiring manager or your potential boss sees about you , ie your linkedin profile photo, is probably a good idea. This will all tie back to your personal brand as well