The cube terrain mountain looks good, although its a bit artificial looking, like a pyramid. What id recommend for cube terrain mountains is to use large cubes first to block in the shape then build out with smaller and smaller bricks and cubes until youre happy with the results.
Also, the aircraft carrier looks a little blocky, I would shape the end to be a little more steamlined. I would remove the fences too, they arent used on aircraft carriers at all.
Overall its got some original blockland charm but its rough around the edges.