But as stated, the tiles should be swapped to some HQ ones.
Or if anything, the Ashenvale tileset has some of my favorite vanilla textures. I don't know how it'd look though.
How about NO? The tiles are fine honestly, it's just that they're too damn striking at the moment.
Those need a whole load of foliage to cover up those rough edges.
Also, as NKnight said, it has that old school vibe to it.
I personally love it even with those discrepancies like the sun(e.g).
I do love that you used the sky-box, BUT...it needs more covering like using cloud spheres, clouds(maybe) and glow to even out that sudden transition between the sky and canopy.
Speaking of canopies and suns, you can do a better sun with the glow doodad placed out with different tinting and at different distance from camera.
As for the previous, the canopy seems all mushy and very uniform-ish which gives it the feeling that it lacks depth.
Also, you might give it some background mountains since now it has that end of the world look to it.