Image SEO, Alt tag, titles and Penalties

Hey so I often cover events as a photographer. Using SEO on images ie: image titles and alt tags when I upload my images to my site.Often it becomes a bit difficult to maintain original and unique alt and image titles.

Could repetition of any alt tags negatively affect my SEO?

I am pretty sure I have loads of repetition.

Other Photographers use a formula of (example of an event photographer); Location and Venue + Event Photography

Manchester Event Photographerso it is quite general in its approach.

Would you get better ranking to have more detail?