Here is an example that went well, http://math.stackexchange.com/questions/173016/inscribing-a-rhombus-within-a-convex-quadrilateral 

I described a compass and straightedge construction in words, and someone in SE posted a step by step illustration, I think using Geogebra.. Not long after, I bought a very simple one-page scanner, and was able to post color jpegs of my original drawings as a separate answer. 

With that in mind, I think actual mathematics symbols should be put in Latex. I dislike it when someone posts a jpeg of homework questions. Shows a number of negative things, including lack of respect for us.