In the Default Process Launcher channel, can we have an image instead of a button or a link?

You can use a web content with dynamic data channel with your image and on clicking it point to the intuitive URL, which is like this ="<a href='http://"&cons!ip&"/suite/process/proclauncher/configureprocess.simplepopup?$p=0&processModelId=15' target='_blank'>Launch Model</a>"

You might want to keep the processModelId in a constant as it keeps changing from one environment to another. Remember that it will have to be manually updated when you move to another environment.

You can use a web content with dynamic data channel with your image and on clicking it point to the intuitive URL, which is like this ="<a href='http://"&cons!ip&"/suite/process/proclauncher/configureprocess.simplepopup?$p=0&processModelId=15' target='_blank'>Launch Model</a>"

You might want to keep the processModelId in a constant as it keeps changing from one environment to another. Remember that it will have to be manually updated when you move to another environment.