Can a dorsal hump be restored? (Photo)

It is possible to build up the nasal dorsum with a variety of methods. One is use of a filler as well as surgical options including a cartilage graft from the nasal septum, ear, or rib depending on how much cartilage is needed.
I would suggest a few consults with someone who does a lot of rhinoplasties. It is difficult to give specific advise based on the two photos you included.

Thank you for your question.

There are many improvements that can occur along the bridge line with a revision rhinoplasty procedure. It's also important to have realistic expectations, especially with thin skin. Thin skin tends to show every little irregularity Along the bridge line. Osteotomies placed in the nasal bones can accomplish narrowing the bridge line and nasal bones.