Though the photos were for your use, the photographer likely owns copyright to the photos.
Your profile doesn't say what country/state you are in so no one here can offer any specific advice.
Indeed, an online photography forum is a poor place to seek legal advice, and you are well advised to consult with a qualified attorney.
Here in the USA, a valid model release is not needed to exhibit the photos, because exhibiting photos is an editorial use of the images.
If the photos were made under controlled conditions, like in a studio, in private, or on-location using supplemental lighting and props then the photographer is well advised to have a valid model release on file for all the images made.
Commercial use of a person's likeness is safer, from a legal perspective, for the copyright owner if the copyright owner has a valid model release on file.
Note that to the average person commercial use and editorial use definitions are not as straight forward as many think.
For example.
Selling prints of a photo that has people in it is considered an editorial use, not a commercial use, as long as the prints are not mass produced and widely distributed. There is no set number that defines "mass produced".
Nussenzweig v. DiCorcia - Wikipedia the free encyclopedia
Photo Attorney Commercial vs. Editorial Use of Photographs of People
Personality rights - Wikipedia the free encyclopedia