One of the things I would like to have developed more are my talking skills, my pronunciation tries to hard to imitate that of native speakers, but I'm not one! so I should talk with my own accent.
I use english way too much, almost every show I watch online I watch it with english subtitles because they are on the web faster than spanish subtitles, plus there's a lot of content lost in translation. I rather read in english than to translate it in spanish, because there are a lot of sayings or word plays that don't apply in our language. I also use it when I'm playing online games with people internationally, I got really embarrassed once like 7 years ago when I said "god thank you" instead of good, thank you to someone else xDD that day I decided to translate everything I wanted to say before I actually say it. I'm finally able to talk with people through the web but my talking skills are still lack the fluency that it should have.