Welcome the the guild!
That said, about your map.
The textures will add alot more, as you can probably see from what you've done so far. the bumpy ground makes it seem a little more organic, so its easier on the eyes.
A did see a flaw thus far, that you might want to fix before going any further. The moat around your castle should probably blen into the river, rather then being set under it.. the cut off between the two is a little bit jarring.
None the less, it looks like the conversion is going good thus far, and take it from me, I'm still new at this whole business and it takes bloody hours and hours to make something even semi complete, ecspecialy when your teaching yourself as your doing it!
Can't wait to see the next phase, and good luck!
-Rob