Hi there!
You asked me for some tips or lessons...First of all, I don't really have any special techniques or magic tricks for my drawings. The first advice I can give you is practice, practice and still practice. I draw for a very long time and almost every day. Little technical trick that really helped me, when I'm uncertain about a proportion, an angle or the appearance of a garment, I take a picture in the context I need and it helps me to guide me (eg see how a vest falls on someone in a particular position.) Then in everyday life I observe every detail that could serve me and I memorize them. We must observe what surrounds us kipping in mind that we may have to draw them one day. Obviously, a software such as Paint tool sai is really useful ... I don't use it since long time because before I was more like pencil / paper ... but this logiticiel makes things really easier for the details and for correct our errors through layers.
Thank you for your interest in my drawings! If you have any questions don't hesitate to ask me.
I paint on canvas and sketch with pencil, am not good with the paint software. I guess in hindsight I really was asking about the software. Thank you for replying me, I really thought you wouldn't.