Your English is really coming along. Even, I think since your first post, lol. If I had to learn Greek . . . I know a few phrases because I had a Greek brother in law for a couple years, Stamatis -- most ethnocentric Americans called him Steve. Τυπικούς χαιρετισμούς? I can't remember much more, and if it weren't for google translate, I wouldn't be able to write it in Greek -- and can't be sure it's correct either -- and my written approximation of the English pronunciation is probably laughable.
Yes, this site originates in the USA, and we have many native English speakers from the US, Canada, UK, Australia, etc. But as you can see, we are an international forum and have members from around the globe, yourself included. It has to be difficult to get your ideas across so that they can be understood clearly, as you said. It's hard enough sometimes when all parties speak the same language!
Professional designer? I wish. I make some money now and then, on the forum or in my private freelance, but I took a turn away from professional art when I was in my early 20s, much to my regret. But it's never too late IMO. We have amateur designers and photographers, wannabees (like me, lol), professionals, and every color of the spectrum in between. But we have a lot of artists who though they may not be professional, may have a lot of knowledge about art, photography and design, and who use Photoshop and ancillary programs with gusto! You're in the right place to learn and you have great start. Thanks for coming to the forum.
We all need feedback (if we are not too arrogant to ask). We get that here. Continue to post your work. We would love to see it and discuss it. 
