@Juno: Personally I would have sized down the tree models, and made a lot more of them all over the place - which would make the other side of the river seem farther away, as it feels too close at the moment - and it would also make sure the mountains seem more big and mountain-like, instead of being on the same level as the trees.
Then I'd say use some rock models as cliffs/mountains instead of just the average tiles - which would make it seem more 3D and vary in looks.
Thirdly, you should update your custom tileset, adding several grass tiles to mix with eachother in the small forest, and the sunken ruins sand for the shores.
Also, you should add some jars with flowers or flowerpots to the foreground, and perhaps some vines hanging from the roof above Cupid and Psyche.
Lastly, I'd recommend making something even more unique as the view of the romantic couple, like a waterfall from the mountains into the lake or something
Just suggestions, in case you get over you laziness
