PE: Presentation matters
It's not just the artwork that tells you something about it's creator - on the internet, the way you present it is at least equally as important. Your painting can be a masterpiece, hanged in a local gallery, but as long as you post a blurry, badly cropped picture named "1564873" along with "..." in an artist's description, nobody will ever bother visiting your gallery. Creating a nice, representative profile page and setting a certain visual quality standard takes extra time and effort, but if you really care for your work (even if it's just a hobby), you should treat it with some respect.
I've already written a related article called The power of context that tried to explain how to place your work in a context in order to better connect with your audience, this one is focused