Why are bags and dark circles still there after lower lid transconjunctival bleph?

It doesn't appear like you have much fat on the lower lids anymore.  And the darkness is due to the blood vessels beneath, which is genetic and rarely has anything that gets rid of it completely.  My suggestion is to see a skin care expert to start you on light laser treatments (clear and brilliant or sublative) and skin care for the eyes.  Fillers in the cheeks and trough work well to help the circles and the volume.  Best, Dr. Emer.

Transconjunctival blepharoplasty with fat removal rarely benefits dark circles which I think you understand now. At this point the simplest solution would  be a hyaluronic acid filler (e.g. Restylane) injection.

Thank you for your question.  From your photos, it appears you have a negative vector meaning your bony infraorbital rim is recessed compared to the projection of your globe (eyeball).  This can make lower blepharoplasty more challenging.  You would actually do well with either a lower orbital rim implant or fillers.  this would smooth the lower lid/cheek transition which is where you are seeing the dark circles.  Seek another consultation with someone who can guide you through this if you are not satisfied with your current results.  All the best!