Hello Susana, I go to Sevilla about 3-4 times per year for shopping and to take photographs, and it's a spectacular city. i love to walk from the Torre del Oro, across to Triana, and then back to the Casco Historico. Then I get the bus back to Ronda. 

I've corrected your text, and it's very good. Please remember in English we only capitalise proper nouns.

About Me

Hello,
My name is Susana. I'm from Spain and live in Seville, in the south of Spain. [you have already said Spain, so it is not needed again] 
I've studied chemistry but I work in an IT company. At first, I wanted to work in a chemistry company and I wasn't really glad with my job. However, after working for some years in this sector, I'm absolutely amazed. At this time, I'm improving my English because I would like to work in an international project.

In the next letter, I will tell you about my city. Seville's wonderful! 

Bye

Thanks!

About Me

Hello! My name is Susana. I'm from Spain and live in Seville, in the southern part of Spain.
I've studied Chemistry but I'm working work in an IT company. At first, I wanted to work in a Chemistry Company laboratory and but I wasn't really glad with my job. However, after working some years in this sector, I'm absolutely amazed.
At this time, I'm improving my English because I would like to work in an international project. company.

In the next letter, I will tell you about my wonderful city, Seville 's woderful¡

Bye

Thanks!

About me

Hello,
My name is Susana. I'm from Spain and live in Seville, in the south of Spain.
I've studied Chemistry but I work in an IT Company. At first, I wanted to work in a Chemistry Company
and I wasn't really glad (better: happy)  with my job. However, after working some years in this sector (better: field) , I'm absolutely amazed. Better: I am very glad I did.
At this time, I'm improving my English because I would like to work on an international project.

In the next letter, I will tell you about my city, Seville's wonderful¡.

Bye

Thanks!