Welcome to the Shipbucket, Yuri!
I really like Your idea to add Sputnik-1 to our collection, but I have concerns about it's size.
I believe that the diameter of the sphere was 58cm, which at a scale of 1m = 22,093pix. gives 13 pixels of diameter (12,81394 to be precise), while Yours has 16 pixels.
Anyway, I hope You'll add many more spacecraft to the 'Bucket.