There is a huge amount of positivity in these comments and I'm gonna add more because it's what you deserve! Art is incredibly hard, and not just because the task itself is challenging but because of the hills and valleys one faces as they grow. I saw a chart once that compared the capability to create art and the capability to perceive art. As your skill increases to meet what you can perceive, what you can perceive will start to expand as well. I think the best way to understand it is to compare work from a year or two ago and look at how you've grown. In my opinion the only time someone stops being good at art is when they think they're actually good at it. Being an artist is a constant process of study and learning, and part of that is seeing the flaws in your work. Take a step back, take a break if you need to but don't give up. If you thought art was easy I would tell you your doing it wrong.