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The sprite looks good but for terraria sprites, never do a black outline. Here is a random terraria item: Here it is again with a black outline:
As you can see the sprite is much better with a darker version of the main colour.
Btw, here is your spite with a different outline:
--> You can...
Have you wanted to keep monsters out but not have a big and ugly iron door?
Do players keep raiding your stuff when your not around?
You can stop it all with two simple items: The key and padlock!
Padlock: Makes a door unable to be opened without a matching key also will make the door...
Its a good start, but your sprites could use some work, here is a tutorial and everything you need to know: https://forums.terraria.org/index.php?threads/beginner-spriting-guide.372/
I recommend reading it, I was an OK-ish sprinter when I read it, and became a decent spriter after reading it...