In general, any picture will work, that is, the game really doesn't care what the image shows. (The player does care of course, but that's a different problem.)
It's complicated to understand what you are trying to solve. I deduced the following, if I am wrong, please tell me.
1. You want to display an image in a tutorial game.
2. The game code looks like Java, but it's too small to really read.
3. The image that was part of the tutorial is gone (not available any more).
4. You selected a different image instead.
5. You get a blank rectangle moving about at the screen, without the expected content of the image from 4.
Assuming this is all correct, one possibility is that the file format of the image is wrong. What did you use, .jpg? Jpg support in image display libraries for games is generally terrible (for good reasons, jpg is not very usable for that purpose). The proper solution is to check the documentation of the function that loads the image. It should explain what file formats it understands. (Try it, it's a good exercise, you will need this often.)
As for a random guess, it's likely that the library supports png or bmp files. Convert your image to one of those formats, and try again. (Or find a different image in those formats.)