Thx a lot man, I still cant believe you wrote so much good advices. I know it's a loooong time science you replied me, I'm sorry. I had this tab open for 2 months :D
I wanted to try those tips but it appears i can't find time for that. I study and work on 4 different projects now, so no way to look into graphics :(
I will surely come back to that post after I finish my studies (about half a year from now on).