They look so tiny Pitgurl! I suppose it won't be long before they start looking less like tadpoles and more like fish.
Have you tried to spawn the parents again, or just leaving them until you grow out your fry? I suppose at least smaragdina are slightly easier care wise than some other species so you probably have a broader market if you do sell any. The splendens complex seems a good one for those new to wild betta species. They are still fairly similar to domesticated splendens and don't need a super low pH or a particularly large tank to be happy.
Got some exciting news of my own regarding my two palangkarensis pairs. They are all in together again after the females got through the divider and then it fell over so I put in heaps of leaf litter to help give the males some space. This included a whole heap of oak leaves my dad kindly collected from down his front driveway.
Today one of the females was looking so barred up she looked like a zebra. I've never seen her so colourful and one of the males is stalking her around the tank (I think it's the bigger, more dominant one). I chucked some more oak leaves up top in case he was thinking of building a nest, and they have plenty of terracotta pots as other options.
So hope they spawn for me. I love this species and it would be great to get some fry of my own now that everyone has finally recovered.