To make it pop out, i originally had in mind an outer glow, to make it more christic, but there is a selected/highlight side to it that may be confusing. Plus, a drop shadow looks good to me also, i'll see which decision i make.
Zarloo, none taken. I see and understand your point and most of the art your recommanded looks pretty, i can't argue with that. But it's not really what i prefer neither what would fit the best for game i think (even if it would do the job for sure). I also personally find it a bit generic/classical/theorical, even if very beautiful.
I'll not say i'm making the most beautiful game ever, i'm not even a game artist in the first place. But as you can see above, work, reflections and patience do improve my artworks (even if your suggested process would imply some as well, on a different scale). And that's what i'm really looking for. I managed to make it cohesive somehow, and that's a huge step for me.
I'm not afraid of having a not-visually-perfect-first-game, if it takes me 3 games before i do a slightly beautiful one, so be it. I don't want to drop/copy style-prefab on it, just to secure the quality of the visual part. I'm not looking for "anything to make it look good!".
I'm confident in my approach leading to a more unique style (even if less perfect) in the end, even if it means more struggling in the beginning.
I hope practice will lead me to control, and i like trying my own things better than copying someone who already found his formula, i'll find mine.