Description from alt text:

A digital illustration of Pinkie Pie from My Little Pony's third generation. Pinkie Pie is a pink pony with even lighter pink hair, happily holding a plate with a piece of birthday cake on it in her hoof. She has a party hat on her head. On the table with her is a birthday present and an opened birthday card, and behind her are more gifts and an array of balloons. Text at the top of the image reads Happy Birthday! Text on the table says @sparkytopia with a heart.

Description from DeviantArt:

Happy Birthday from Pinkie Pie! a little demo featuring everyone's favorite party pony for my current YCH :) This YCH will be open until the end of the month, so it's not too late if you want one for yourself! Thanks for looking!