If you are looking for software with more features to make the image in
Inkscape is an adobe illustrator kind of program(a favorite of mine for any kind of project)
http://inkscape.org
GIMP is more like photoshop.
http://www.gimp.org/
There is a little bit of a learning curve because they are free if you have not used them before, and since they are opensource if you use the right order of tools it may spontaneously crash so save often.
I like the new FIRST Competition Event chart. If you add the description when you show the chart, it basically is the FIRST flow chart. For any rookie who does have a Event management question pit admin would be able to point them to the correct person, and that is the only column your chart leaves out.
What do you think about putting a tab under pit administration for specialist. From my experience, pit admin is the best place to go to find a volunteer specialist who can help with a problem specific to your robot(or they can announce it to find another team with a helpful mentor).
P.S.
I generally recommend to rookies to use Pit admin as a omnibudsman of sorts. Even the rookies I have seen at pit admin are able to point you on the right flow chart path.