Edit: Size correction
Try both out to see which one you like, but first one is probably best, since it's closer to your original and still has the black ventral scales. Its size isn't the same as the NPC portraits, which is around 2400x 3800, but you probably won't notice the size difference too much. Only the style.
Yeah, the ventral scales don't look as black now, maybe you can edit it some day? It was an accident anyway, but it came out really cool, so I'm letting you decided if you want to use/keep it, if you like the style. If you want to use it in game, you might have to make a copy and scale it down for the game, around 1900x2800 - 2400x3800, but It probably won't be an issue.
