You can easily get ASCII images from a range of different platforms online. ASCII images may be necessary for some of the projects that you may be managing. They are usually important for programmers and people who work on other technical stuff. You will want to work on them too if you know what is required from your end.
But in order to proceed further and get to work on your projects, you will need ASCII images and luckily there are certain websites that can help you with it. The only thing you will want to check is whether you are allowed to use these images for commercial purposes.
People who create and share images of all types may have their own licensing conditions that they may have set. Some would allow you to download for personal use and others may disallow downloads for whatever reasons. Yet you will come across certain websites such as Text Images that offer Free Ascii Images to download and use without any restrictions.
The majority of websites that offer ASCII images would appear to be fine if you use them for personal and not commercial purposes. If you believe you will be using these sorts of images for commercial purposes then getting their permission beforehand would be the best way for you to proceed.