Do's and Don'ts- FlashLight

Bad version: (TwilightSentry Star)

-Colors are literally copy-pasted from a screenshot, I don't have to explain why this is genetically impossible. Use your Punnett Squares people!
-Her eyes are not only mismatched but have 2 different colors per iris. Heterochromia needs reason or least sensible colors. 
-Alicorn OCs are overdone, especially when it comes to Twilight NGs. Only a few pairings have logical alicorn outcomes and only certain artists write them well.
-Stereotypical "I don't wanna be a princess, I wanna be a royal guard!" OR "I'm the next Princess of Friendship!" mindset.
-Cutie Mark is basically Twilight's.

Good Version: (Eros Eternia) 

-Family Inheritance from: Shining  Armor and Twilight Velvet (By means of lighter coat color).
-Eyes are one color and are a sensible mix of parents colors. 
-Unicorns are common in the family. 
-Has other interests besides science or fighting but you can still tell that they're a product of their environment. 
-Cutie Mark actually has something to do with their talent.