Here I answered a question, but before doing so, I did provide anonymous feedback, from review, that the question needs improvement, but I got two downvotes, not because of the answer, so am I not allowed to answer this type of question?
You answer it at your own risk - and encourage behaviours that could hurt the OP in the long run
You encourage the user to ask poor questions (rather than trying to educate them to do better), and a pattern of this might lead to a question ban
Your answer might get invalidated if OP changes his question substantially, and you'll get downvoted for either of the above.There might be votes on the answer on its own merit in either way.
If you want to be helpful, and you should be, you should comment asking the user for clarification, try to embed inline the image linked, or better yet transcribe the contents of the image and more or less help the user get their question into shape first before trying to answer.