6 months post op - Am I developing symmastia or tenting? (photos)

The submitted photos show a definitive separation between the breasts, so it does not appear you have symmastia. If you are noticing changes that concern you I encourage you to visit with your surgeon for an evaluation.

If you could provide some views with the arms relaxed and without a bra in place, that would make it easier to determine exactly what is going on. If you have before photos as well, those would be extremely beneficial.

It would be helpful to see your nipple position. With symmastia the nipples tend to go towards the outside part of the breast (a more lateral position) rather than pointing straight ahead. However, it does look to me like you might be developing symmastia but there is a pretty easy way to check.

I would suggest laying on your back and putting pressure on the implant to try to move it towards the center and if either implant crosses over the midline than that is your confirmation you have symmastia.

You can have something that looks like symmastia (the tenting of the skin you are referring to) without having a true connection between the left and right implant pockets when a breast implant encroaches on the other. It appears to me that your right breast is starting to do that. If it has been 6 months I would not imagine the skin will stop tenting and will likely progress. I would see a surgeon to have a physical exam to confirm.