I hope it's alright I entered your challenge - I didn't see that actually people are asking if they are able to join
Though, I really wish your sister likes that drawing, don't want to disappoint her :D - I've done my best, but it got a little bit changed when I scanned it, and I'm actually pretty nervous when it comes to thinking, if it's really good enough for entering anywhere :p
However, what's more important: I hope your sister had a great birthday - or will have, I'm not sure So, happy birthday, Nikki!
And I have to say, it's a really nice idea to get your sister drawn! :)
Oh, by the way, it's my very first entry on here, so don't be too hard with judging me, haha! Though, constructive critics are always welcome of course, and I'm happy to be able to get better!
(I hope it's okay I dedicated my picture to you? Thought I drew it for your challenge, so it would be fitting, right?)