The harsh shadow from the calculator really hurts this image. You could soften the shadow and increase the lighting by using a reflector (foam core, white cardboard, whatever) camera right. The color balance is also slightly off and the DOF is too shallow such that the calculator is out of focus.
The focus is not true in this shot - and the shadow is really distracting. Try a tripod with a longer shutter speed. Nice angle usage - just little things that mean a lot.
The arrangement and composition of this image is fine.
Lighting and color could be improved. The shadow of the calculator distracts from the image. Adding lighting from the right would mute the distaction, illuminate right side detail and add interest to the image.
White balance is off which gives it a yellow hue that should be corrected in post processing.
You might also consider shifting your central focus point from the center of the calculator to the "5" on the keypad. That would excentuate the effect of your shallow depth of field and minimize the distracting effect of having the near foreground slightly out of focus.