The one the left is a catastrophe.  
-The colors are just Rarity’s and Applejack’s  
-using patches for the coat only works for ponies whose parents are like Princess Luna, Pipsqueak, and Sunburst  
-I literally copied and pasted the mane styles of Applejack and Rarity one this poor pony.  
-the eyes are just wrong, Heterochromia may work for a non-shipping OC but for a Shipping oc, it’s pointless.
 
The one on the right looks much better.  
-More mixing is used for the colors (I even used a bit of Sweetie Belle’s mane for her mane colors)  
-the eyes are blue like Rarity’s.  
-can pass as a non-shipping foal