You cannot learn how to paint in just a few weeks - the old masters spent years as an apprentice to master artists, and many more years refining their skills. You have to plan your learning program and work on it every day if you want to be a great artist. You need to build your foundation on solid principles. I believe there are about 500 to 1000 individual skills or chunks of knowledge you need to know about to become a good artist. I think the word 'talent' is overused in the art world. Talent only plays a role with the one or two painters that become elevated to the status of a great master. For the rest of us, it is not talent, but knowledge combined with a lot of hard work. Some people just have to work harder at it than others. That is what makes you a good painter.
Happy painting
Barry John Raybould
Virtual Art Academy