The sinks don't look too small to me. What is the depth of your vanity. I measured the counters in both of my bathrooms and they are 22-1/2" deep. The sinks in both bathrooms are 3" from the front edge of the counter. You might think that your sinks are too far forward because you faucets haven't been installed yet.

Your sinks do seem close to the walls but that is due to the overall cabinet configuration. They look centered over the cabinet section that is below them.

The sinks are usually positioned about 3-4" from the front edge. If they go further back then you are leaning forward more and they can be uncomfortable. It looks like the sinks you have may be smaller front to back than other sinks on the market. Once the faucets go in you really won't notice.

It is hard to tell from your picture, but the piece on the right side of the right sink looks smaller than the piece on the left of the left sink. Is that possible ?

I think they are a little further forward than most sinks have typically been - BUT this is a trend that's starting to happen more and more. It allows you to not lean over as far and gives plenty of room for the faucets and countertop storage. I say it's fine, just a preference call.