this is really good for one of your first oekaki's! and i'm sure with more practise you will improve, digital art is becoming more and more popular and in demand so by starting to learn now in a few months you would have already improved greatly. just as a heads up if you are a little stuck or confused on how to do things on oekaki like layering/shading/smoothing etc here is a well explained guide. i look forward to seeing your art and art style develop as you learn overtime. good luck with the tryout!