Quoting Maxim Schupack
Hey Felipe. Nice build :D The 737 is a great aircraft and I really think you did a good job. However, I think two things need to be worked on. First the winglets are not 737 winglets, they are too low and not L shaped enough (it's something you can easily change). Second, if you look at a 737, you will notice the engines are more oval than round, which I think would be a nice addition to the model. I might be just me, but I think the engines go a long way in defining the 737. Anyway, congrats, like this model a lot :D
I know you would mention the winglets! They look also some kind of disturbing to me, but it was just a quick solution, because i havent' got much time...