Loosing image quality when exporting from Lightroom

Hi there, 

I am doing some edits and find that when I export the images they look owfull. I have try all the tips that I read here in the comunity and in youtube/ google. I do not know what i am doing wrong but it is affecting my work flow. The picture looks very pixelated and not smoth at all after it goes out of lighroom. 

This is how the picture lookes ans the setting I am using to expost them.