Lukaku is on a season-long loan from Chelsea and notched his 11th and 12th Barclays Premier League goals of the season during Saturday's 2-1 home win over Sunderland.
But there is no question of the 19-year-old, signed by the Blues for £18million from Anderlecht two years ago, becoming carried away with his success.
He has clear visions to eventually become a star player for Chelsea and picks up a copy of every game from Albion's technical staff so he can work on his strengths and weaknesses.
Lukaku said: "You have to be focused. I'm not wasting my time with my career right now. I'm 19 but I know what I want and I know what I want to realise in the future.
"What can I improve on? Everything. I just want to be as complete as any player wants to be. I don't think now I can say `this is good'.
"My heading, my defensive part of the game, my skill rate, everything I work on. You can never say something is perfect. I think Cristiano Ronaldo never says something is perfect. He works on everything."
Lukaku added: "I watch my games every day. After games I will go home and watch the game again and see what I did wrong, what I did well and improve on it for the next game.
"I take a full copy of every game home on DVD. It's normal if you want to be at that top level. You have to know your game, you have to know the details of your team-mates and what you are doing on the pitch."