Did i not end good enough?

So like i have another account i have fun on right. Its currently level 12 and i had played sivir and welll...i lost i can try and find a replay of the game and post it here but did i not close it fast enough or ? https://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2763686193/244383903?tab=overview