It really depends on what kind of phone you have and how big your screen is, but you can pick almost any photo and crop it to fit the way you need it to fit.
Younha has taken quite a few photos of herself recently (presumably from her iPhone). Those photos (included under the “Read More”) would most likely fit your screen very well, even if you don’t have an iPhone.
Other than those, you can just go through my recent posts and find other photos you might like. On many of my posts, such as when I post photos from a concert, you can click “Source” in the upper right corner to view more images than just the ones I posted. I always make sure to specify in my posts whether or not there are more photos at the source.
I hope this helped! And remember to click “Read More” to see the specific images I mentioned!
^^^^^(I highly recommend this one haha)^^^^^