(Glitch #391 was boring — nothing but a comma splice — so I decided to skip it.)
Always capitalize the first word of a sentence.
(Did you catch the typo in the first sentence?)
Change the comma after pencil to a period.
You’ve been sketching your soulmate’s face ever since you were old enough to pick up a pencil. The drawings have become more realistic through the years as the day when you will meet comes closer.
Notice that I added a few words to improve clarity and flow: In the first sentence, since is now ever since. In the second sentence, become is now have become, and the day you meet is now the day when you will meet.