Hi there and welcome
Do you mean the resolution of your photos? So the resolution is higher or lower?
You can use this website to resize the picture to less pixels. Its free and you then get the resized picture that you can use for ebay
Upload the photo, set the pixels you wish and you can then resize it.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please.