Most Helpful Girl
There is no "correct" way that applies to everyone. I've seen people delete all pics once the relationship was over, but I've seen people who still have pictures up of their ex after 5+ years.
If your ex has unfriended you, I don't see how respect plays a role. It's not like she'll know if you delete/hide the pictures. It also depends on your new girlfriend. Has she said anything about wanting the pictures gone?
Most Helpful Guy
Highlight them with ur mouse and right click the. Delete
Next is to click on ur trash and right click then empty bin
Move on, not delete them out of respect for her? Bro
U delete them out of respect for u and ur new gf