There are two situations I load images, first, just directly from the internet, and second, load images that are downloaded in the device. And whenever I load, 8~9 out of 10
You can turn on Picasso logs using Picasso.with(Context).setLoggingEnabled(true). You will probably see an error message with a reason there.
Picasso.with(Context).setLoggingEnabled(true)
It's also worth logging the URL you are using and trying it a browser, just in case.