These couple don't have a huge difference but it shows how nicely normal Bettas can mature.
Punkin is a VT, he is the largest Betta I have had so far by body size. He's gone from a less than a gallon critter keeper to his 10 gallon aquarium lol. He and I have come a long way, I've had him for almost 2 years now, he started out as a small orange boy with pretty green/blue fins. He's now a darker orange with metallic shimmery green along the top of his body and his fins are more purple with red and some bits of blue.
Epilepsy was an HM. He was a brat lol, he had a very bad problem with biting his fins and unfortunately he ended up tearing them down to Plakat size before I had to put him to sleep due to Lymphocystis. He was such a pretty boy and really grew up with great colors.