Ummm, the maps seem to be a bit plain, the world map needs some mountains and different colors in the water, random islands and some other stuff, the waterfall also challenges my logic, unless it's a river?
The second screenshot is also a bit plain there needs to be more stuff or path, random squares of water, maybe a lake, a river, a waterfall, it looks plain but I just can't put my finger on it... OH, try adding platforms to it, so it's not just one flat layer, also adding rocks would help.
Overall your mapping has improved A LOT, but there are those tweaks and stuff you still need to learn.
Thank you and have a nice day!