[RWebb]

if no tripod then add light - lots of it

another trick is to use a background not too dark or light - close to the shade of the parts - e.g. set them on burlap instead of a white cloth & see how you like that

you can also put them on a sheet of glass, with the burlap a foot or so below the glass - you can make them appear to float in space

good luck & have fun