Correction: Baby Bowser is Bowser when he was a child, while Bowser Jr. is the actual kid of Bowser (Who may or may not have a biological mother... Who knows how Koopas actually reproduce... Though there are female Koopas, so there's that. I don't even know what's up... We'll just say Peach really is the mother and they lied at the end of SMS, cause this nitpick has gone too far. Don't even get me started on how in the world to figure out what relations the other Koopa Kids are.)
But, yes, I do think you did very well drawing from memory. Seems to pay off most times you do it.
Correction: Baby Bowser is Bowser when he was a child, while Bowser Jr. is the actual kid of Bowser