We get questions like this all the time, where someone wants us to draw something for them in TikZ or some other graphics package, without providing a minimal working example. I'm wondering whether there could be an automated notification encouraging to provide an MWE while entering such a question. I would propose the following:
If a user tries to submit a question containing an image and no block of code, they should receive some feedback explaining that they should provide a MWE and possibly linking to some further information about this issue. This could be an error message that returns them to the editing window or an "Are you sure? Your question is not likely to be answered."-Yes/No-dialog.