The first part of the logo is the company name "Gacela Constructora Sustentable." 'Gacela' means gazelle in spanish and 'Constructora Sustentable' means a sustainable and green construction firm. The Gacela part is the main part of the name therefor it has to be given more importance. The 'Constructora Sustentble' part shoud be written with a smaller font and maybe, if the designer finds it suitable with a lighter tone.
The other part of the logo is the Gazelle (yes the animal). This is also another must. The gazelle design is pretty open to the designers creativity. You can put a full body gazelle, a running one, fighting gazelle, the horns, the design on the face, the siluete, the profile, a head on gazelle.... I dont know. Fell free to use your imagination. I´m attaching some photos that I found on the web of gazelles that I liked.
Because of the nature of the construction industry it is very important that the gazelle has a serious, and manly apearence because a femenine gazelle does not fit the profile.
Colors are also open.
Words that can help:
Remeber we want to be seen as a different kind of construction firm but at the same time we want to be taken seriously.