View the edges at around 300% and you will see that there are artifacts or the edges are not smooth.
As @Ralph Lear says, your Photoshop cutout skills are not perfect, even that I have to admit that you did a good job.
But as a thumb of rule, cutouts are very time-consuming to be done correctly. I would guess that it's rarely profitable. I recommend taking the pictures straight in the right environment.
The jagged edges caused by the cut out are distracting, but even more so, the lack of any shadows, which seems unnatural and makes these objects appear to be floating in air.