PIKO T-Shirt Design

In the last years I have found myself thinking of creating a clothing brand inspired by brands I like. So I bought a pen, a cheap one, and started scribbling my first ideas. After 3 days of work this is the result. I'm proud, could I do better? Yes, of course, but it's a constant evolution and if I can create the brand, I want it to tell the story of that evolution. Please comment and share, I need your opinion.