Depending on the size and complexity of the picture, and the size that you are re-creating it, this type of project can be considerably faster than the old-fashioned oil painting or watercolor, and may be more impressive to certain groups of people. Digital art buffs are become more and more the norm in the art world, and this genre is helping to get people into something they may have otherwise ignored, all because of how it was created.
Microsoft Excel is a fantastic tool for analyzing scientific data. Microsoft Word is a fantastic tool for writing up scientific research. So surely Microsoft Office is the only software a scientist would ever require beyond that associated with specialist scientific apparatus? Unfortunately, that has never been the case and most university researchers would identify one big problem with the Office suite and that is why it‘s always been difficult to present formulas in Word and Excel. Even when you type a simple fraction like 3/5, it gets presented on a single line. As for Greek symbols like pi...well, that would mean many hours wasted trawling through Excel‘s Insert Symbol menu.