If you want a more traditional look, I guess that you mean like a realistic painting, then it is too dark and light IMO, the value (which is more important than hue BTW) goes all the way from black to white.

The hue (or “color”) seems to be chosen more for style than for representing a real nut/fruit, in nature usually nothing is very saturated, it’s quite dull! So try out some dull brown colours and try to make what you can with them. That’s what you do when painting, maybe you can try it out digitally.

As you ate doing digital, you can check out values by switching your painting to black & white (just removing the saturation doesn’t work well).

I’d put in a background too, could be a dull color, but that’s just me :-)

Good luck!