Well yes, but this is windows 10, on a full colour display with plenty of pixels to show me pretty graphics.
I've seen this happen more than once too, people are quicker to upvote someone who says it's their first time/that they want to show their friend that their art is appreciated. They're trying to share some motivation to the artist, I suppose. (Which works, I had a similar thing happen to the first drawing I posted online).
I do agree with
@xSuperMario64x, sometimes it just depends on the audience. That said, even with the right audience it's always a hit or miss.
What happens to the popular posts is that the amount of points snowballs. Most people don't start scrolling at the newest posts but they start where the most popular content is, so things that have more points will gain even more, faster. People are also sheep, and they are simply quicker to upvote something that other people have already marked as good. I remember reading about studies done on this, where random comments that started life with even one extra upvote had their average end score 25% higher than those that did not.
This makes it kind of random. It depends massively on which people happen to stumble upon your post, and if they give it the momentum upwards. I've seen people post something that got drowned, only to post it later and have it be massively upvoted. I don't recommend trying that, but it does show that the amount of points you get isn't really a good indicator for quality. It's always a gamble. It's always going to be inconsistent. Remember, the successful posts that you are seeing are only the ones that happened to make it through this lottery and became successful. You're not seeing every post that didn't make it!
I'd just imagine those 15 people standing in your room to tell you that they liked it. And they did, because they decided to upvote, that wasn't an accident. Apart from that, all you can do is keep going!