A listing with photos of real work reads as an active business. One with none reads as abandoned and gets scrolled past. Five or six taken on your phone is enough, and they do not need to be professional.
What to take
Your work, before and after.
Your van, your premises, or wherever the job happens.
You, or your team.
Use real photos of your own work rather than stock images. People can tell, and so increasingly can the systems summarising your listing.
Then keep adding
Add a few more whenever you finish a job you are pleased with. It takes a minute and it is the part of the listing people actually look at. One or two photos reads as unfinished. A handful reads as active, and that is the whole distinction the check is drawing.
What not to bother with
There is a lot of advice about renaming image files, adding location data to the photo, and uploading on a schedule. None of it is what this check measures, and none of it is worth an afternoon while your listing still has two photos on it. Take ten pictures on your phone and upload them.
What it is worth
The finding prints what it is worth on your scan as X of Y points within Local presence. It is one of the lighter items on that list, so do the listing itself, the website link and the reviews first if any of those are open. It is also fifteen minutes, which is a better rate of return than most of what is above it.