Reward model

Hi, I would like to train a reward model that is trained on preference data of image pairs (one image is always preferred over the other). In the end the model should be able to predict a score on a single image. Do you have any experience what kind of network would be suitable for such task? Most research I found was in text-image pair setting (for example the ImageReward paper), but I couldn't find anything just for pairs of images without text.

Thank you!