His eyes are so equals? Desu is a copula meaning something like are, is, or even the in some cases. Watashi wa Kitche DESU. I am Kitche. Wa is a particle, it just says that watashi (I, me, muself) is the subject. Kitche is the object, and desu is the verb. In japenese, the verb is always last, but the subject and object can switch around, so they need particles.
A tablet gives you a better control when drawing compared to a mouse, unless you're really godly good with mouse control. Photoshop is the software that lets you draw using the tablet. It has several different brushes that can even imitate a real brush/pen stroke or watercolor effects etc. Give it a try!
Sorry I took ages to reply and thanks for the comment! <3