The forest is okay. The lava is amazing, the castle looks really nice on that mound. The last three I didn't like, very plain I don't see the point in 3 of the what is basically the same picture.
How did you make that long ramp in the last forest pic(one with the spirit guy)
I like your lava pictures but I think you do more with the walls. To me it looks like you used just one doodad that looked box-like and enlarged it. I would suggest using a couple of different doodads to form each wall segment and copy and paste them.
Well, I have updated my first post with a link to my terrain showcase at the Hive, because as you see I started to update this one, but the uploading takes much longer. I may add any new terrains here also, but I do the job would be tedious for me to upload all the others I have at the Hive here too. Anyway, I appreciate critques. Thanks.