I could write pages and pages of advice and recommendations however I'm not going to since it would takes hours however I did post this in 2009 under my previous moniker, message #3963173 - 4th message down:
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webmasterworld.com...]
I have thousands of pages with images yet I still try to adhere to the principal I created in the 90s of a maximum page weight of 100K, they loaded fast then and with today's connections they are instantaneous even on slower mobile connections.
Two major observations / experiences I have about images and clicking through to larger images.
1. In general SEs seem to prefer a fresh page with that larger image plus all its relevant details.
2. I really like using Lightbox and it is a very simple and very efficient way of displaying just a few image enlargements or even a lot of images creating a gallery
HOWEVER, in general, whilst images using Lightbox can sometimes rank in the image SERPs, very rarely will they rank in the regular SERPs.
Just trust me on this, I have experiemented with hundreds of thousands of images, more likely millions, over the past 25 years and whilst a Lightbox image may occasionally rank in both SERPs it is absolutely nothing that can be predicted nor relied upon, a dedicated page is still the only way to go even if one only completes the title bar, description, H1 and a little on-page text.
I hope that helps.