Why are you using a straight-on perspective? I always prefered having the camera psuedoly looking a bit down on the side from above.
It's a mix of skill and preference.
We made the first game with really crummy graphics that I'm almost ashamed to show here.
For the sake of seeing how far I've come here it is. (http://coffeehat.uirpg.com/projects.php?id=1)
I've noticed the overly vibrant colors actually do hurt people's eyes. So I'm toning things down a little. Still vibrant, but not eye bleeding vibrant.
I've been playing with the grass tiles a little. I'm not sure if I should change the colors or just add another one or two.
(http://www.theywilleat.us/images/comparison.png)
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