The progress is looking good. At the bottom of your posts, you show off the bank of the river with all the rocks and stuff. This area is coming along nicely, although I would wait until you have the base landscape done and set in stone (no pun intendid) before you set dress (this will prevent a headache trying to move all the assets that you placed back to the new base mesh). I would say the biggest two areas that need some lovin, are the sky (use your own, its really easy, ill show you in class if you want), and the overall 'mountains/river banks.' i found that sculpting the base in zbrush then retopo in maya to be the easiest way to do this that have the best results. let me know if you have any questions.

Great progress though...