I just like to say, that I don't think that too many tutorials will help you. A tutorial, both in writing with photos or a video tutorial, can be helpful indeed, but in the end you need to sit down and do a lot of painting. If you look at too much and read too much you might end up being distracted by the amount of information that it can hinder you in what is really the key to improving your skill: practice! If you have one or two tutorials that you already find helpful I would suggest spending your time at the painting desk instead of hunting for more tutorials, and then taking time to watch/read them. You can always add another tutorial to your library later on, when you feel you have gained as much as you can from the ones you've already got.
I experienced this effect myself, some years ago. I spent too much time searching the Internet for articles and tutorials, and when I actually sat down to practice, I became confused by the amount of techniques, methods and tips I wanted to try out. Some of them were contradictory, and I didn't know which one I'd go for. In the end I sort of went back to what I'd done before, but applied a few slight changes to make small improvements of my techniques. It was a lot of work for quite little effect, and I experienced a lot of frustration during the time.