Awesome feedback from everyone. It has already been said, but choose a single graphic set and stick with it. Time Fantasy, 7 Souls, or High Fantasy are popular right now.
Check https://www.gamedevmarket.net/or https://itch.io/game-assets
You can also find some graphics on the Rpg Maker site or Steam on other websites that allow you to use it outside Rpg Maker.
I don't have much time tonight, but let's look at this monstrosity to see an example of what everyone is talking about:
1. Transitions: If done correctly each connected map should look like it is connected (like a puzzle piece). Look at this map how some of the maps line up (trees, grass) for the most part look good/okay from one map to another. Then we get some maps that lines up the grass/hill on one side doesn't connect or is not the same size as the other map next to it. There are even instances (bottom left corner and top right corner) there is no connection at all.
2. Mapping: The areas are large enough for exploration and combat (even with several players). We got a pretty straightforward path through the area; however, we have some exploration areas as well. The problem is depth. Some of the hills are mapped to the correct height and flow correctly. Then we get others (Top Middle/Right) that throw off the depth. There is variation to the terrain decorations in some maps that look okay/good, but we get other maps where the terrain has little in it or repeating decorations next to each other.
3. Ground/Mask/Fringe: This is important because it affects the character within the game. I will get back to this one later, if no one else does it is getting late here.
Btw feel free to discuss the map and tear it apart for education purposes