Get some new color pens and a ruler with some kind of kick arse design on. Should make drawing a map a little more intresting.
! On a more serious note, get some people to play it, if there reactions are good and omg i want to play more that should up the motivation a bit. Get the map in game!
If its not fun dont do it mate! Forcing yourself will do you no good. Just get back to it when you feel like it. Either way, it doesnt really matter, its just a map. Not the end of the world
Probably the best way is to first flesh out the gameplay of the map (so no attention paid to graphics, just plain brushes) when you still have motivation to do it, and when that's done and perhaps testers have given positive feedback, you can do the fun bit of making it pretty.