Verify schematic and board to get it ready for commercial release
It depends on what sort of review you are looking to get. Perhaps the better approach is to prototype. It will likely cost you less to try ten times than to pay for an expensive consultant. Professional review is useful but there is an appropriate time in a product development cycle and it may not be with your first ever pcb.
True design review requires a team of dedicated, experienced colleagues. A proper design process is critical - in order to have any hope of checking if the schematic is proper, you must  first specify and write down in great detail everything that you are trying to achieve.
As a substitute you may look for a  dedicated engineering consultant, it can be very expensive, they take a lot of risk for looking at your design, imagine if something goes wrong and you think they should have found it.
Review for specific factors, like manufacturing, is more common. You may have already experienced it! If you order a pcb and they say &quot;this copper is too close too edge&quot;, that is design for manufacturing/manufacturability (DFM) review, because their equipment will not reliably produce such features.
DFM review quality varies by pcb producer, and may be specific to their services. For hobby level facilities it is usually an automated tool to ensure that you follow their rules, for commercial fabs there is usually an actual engineer reviewing your stuff. This can be found third party consultant and is a more standard service.
Other types of specific review, including Design for Test (DFT) and design for cost (DFC) are also sometimes  offered, the theme here is limited scope and specific deliverables from the review .
As an example, a possible requirement of a review with focus on cost and mass production is to identify single source components and propose alternatives so that production dept can better manage price fluctuations and shortages.
Finally, the better your design documentation the better, and often cheaper, is the review!