As requested, I'll give some feedback to your application.
First some nitpicking, concrete feedback to the placement of blocks:
I'll ignore your first theme build, because you obviously already improved without feedback.
Your docks theme build (
link) is better, but very straight. The balloon only has some curvature at the ends. The docks themselves are also very straight. Useful rule of thumb: if you feel like WorldEdit would do 90% of the building process, it probably means that your building process has too many massive planes and cubes and too few details. I'll refine this rule of thumb in the future.
The ship is quite okay. The prow could use improvement.
Your next theme build,
water, is already much better. Pretty much perfect level of details: not too much, not too few. Streams through fields are very common in theme builds by adventurers/commoners, but they're not realistic. They would wash away the crops. Water comes from the clouds and underground water flow. The windmill is a bit out of proportion: the round base is too large compared to the top part. Otherwise it's really quite good. Last things: take a close look at the main map for roads (don't use default path blocks; keep them horizontally straight) and I don't see the point of the little walls across the wheat field. The fences on the brick walls don't work great. But a good theme build.
Looking at both the half dome, the portico entrance (from freebuild) and also again at the balloon, I recommend to take a close look at how domes are built (Pelargir has many examples). Basically: build a
horizontal circle; build a small
vertical semicircle on the first blocks of the
horizontal circle; build a larger
vertical semicircle behind the first semicircle, again following the
horizontal circle layout; continue doing this till you have built vertical semicircles following all blocks of the horizontal circle.
If you did this correctly, you can do the same from another angle of the horizontal circle (if you rotate your perspective 90 degrees and move) and it will overlap with what you did from the other angle.
Brb with an explaining GIF.