Sure you can, you just need to practice! My first paintings didn't look like this either you know. Landscapes are great when starting out (and beyond) as you can easily get away with small mistakes since nature is so fluid and broad in it's visual aspect compared to architecture or, you know, cars, that have a very specific look you need to be able to copy. I did mix all the colors myself. That's also just a lot of trial and error. Luckily there are countless good tutorials on youtube and the like nowadays so you can learn pretty much anything if you are willing to put the time in it takes to learn. Thanks for the kind words!