Despite the 16-bit limitations of the game itself, you did a pretty good job overall.
I offer you now this challenge: make Death Mountain Peak into a daytime scene with the same lighting adjustments you made to this first bit. That to me would be an achievement in itself.
Post the exact map you want me to modify, and I'll give it a go.

I would need to change the colors completely to reflect broad daylight, which should be interesting and fun. I only ask that you post the source material so I can get the right map, and the computer I work from cannot have TF or emulators on it as per request from a paranoid relative.
Dusk? Mid day? Morning?
Any other 'improvements' I do may not turn out as well as the first one, I'm still learning Photoshop and it's tools. and maps that are too large might throw me for a loop, that section of Crimson Echoes Singing Mountain was easy, it was pretty small, and I knew from the get-go that I wanted the bottom of the waterfall to be the source of the light, and at night.
Hell, if we were to mildly light-source the sprites, I could create one hell of a mock-up screenshot that could break some chrono-fan hearts, and hopefully embarrass SE a bit, or at least light a small creative fire under their inactive butts.
Release to Digg or something... "What a real Chrono Trigger sequal could look like (or better) l if Square still cared about you."
The ol' guilt-them-into-action routine. Or would that be a bit much?
like the attatchment, only better menu, and shaded sprites from the DS version (with the new bars).