The Don’ts:
 
-Literally all of the colors and even the hairstyle are copy-pasted from her parents.  
-Full-rainbow manes are a really lazy way to handle Rainbow Dash fanfoals; very few IF ANY can make it work.  
-Heterocromia; very few make it work and for those who don’t it’s just lazy, in my opinion.  
-The cutie mark is super generic; it’s literally the Wonderbolts symbol with Dash’s colors slapped on.  
-Way too many SoarinDash foals have a generic personality, like “they’re is a fast flier like their parents and they want to be a Wonderbolt”.
 
The Dos:
 
-The colors are more original and the hairstyle is unique while still staying true to her parents.  
-Instead of a copy-pasted light blue coat, she inherited a deeper purple from her grandfather. Inheritance from other family members always makes the fanfoal more original!  
-Instead of a full rainbow, her hair is made up of only a few select colors (in this case it’s the primary colors).  
-Both eyes are the same color; somewhat of a variation of her dad’s. Also notice that she has a unique eye shape.  
-The cutie mark is less cliche and so is the talent behind it. How many SoarinDash foals are good at things OTHER than flying and athletics?  
-She has a well-thought out and unique personality/backstory that sharply deviates from most Rainbow Dash foals.
 
Keep this in mind when designing a fanfoal of your own! Most of these tips apply to all fanfoals and not just SoarinDash kids. Don’t be afraid to deviate from the norm a little and just remember (well-thought-out and realistic) constructive criticism is your friend!