You might have noticed that on Second Life, no two promotional or profile images are the same size. It would be nice if the same texture (size) could be used in many situations but no. So I’ve put together a pack of standard image sizes.
Also, on my Marketplace, you can find a bunch of social media graphic-sized prim boards if you’re designing with Canva or something similar, so you can use the proportions of the original image. (You can resize the boards by dragging the corner, and the ratio stays the same. Just don’t drag the sides or the ratio will be lost.) At least the current profile image uses a square 1×1 photo, with pixel dimensions 150×150 or 200×200 at most… Want a sample? Sure.
Click on the image to see the original file, then right-click on the image and click “save as” to use it as a template for your own Second Life images.