Several years old. Was playing in sai and ended up with lineless style pony. I also went a little overboard with the cutie mark (Just meant to be a firework).
Meet Fire Cracker
Raised in Canterlot. Mother was a teacher at the School for Gifted Unicorns and father was a member of the guard so both were a bit disappointed when their daughter had more trouble with her magic than either of them had. Often things would explode when she attempted to lift them as a filly. However, with some significant amount of tutoring, she got some control, but the explosions are still easier for her to accomplish, so she works as a member of a pyrotechnic team to shoot fireworks at major royal ceremonies, such as the royal wedding.
Some notes, I know I went a tad overboard on the cutie mark. It was meant to be a firework and, well, I over did it on number of colors and it looks like a giant mess now.
The lack of eye whites is stylistic, they'd exist on a base or otherwise normal looking pony.
Mane is also more stylistic in the way it's done, with lots of strings of color rather than blocks.