You're off to a nice start, though a couple of points for consideration...
You've got some issues with your rivers splitting where, generally, they don't do that (although some of them may be deltas?) Take a look at
this thread for some help on how rivers usually work.
Do you plan to include a scale to give people an idea of the size of the land?
What software are you using? Some of your lines look a bit pixellated and maybe could do with a little antialiasing.
I like your land shape and your mountain ranges look realistic to my untrained eye. I think this will look good coloured, and I'm looking forward to your next update.
