As a fellow artist, I can relate, Stardust. Art and writing (while they may be the same on the dictionary but that's besides the point I am trying to make here) are as different as light and darkness when it comes to the creation process. Writing is rather straightforward, you have an idea, you write a plan, you write it and then edit. With some experience, it's quite easy to get decent results, especially when you have a good imagination and the ability to translate it into words.
Now let's look at art as in, creating a drawing. It also starts with a plan, I guess. Drawing usually isn't something that you do for the heck of it but it comes with inspiration, a prompt for example or a certain mood you want to convey. But when it comes to the 'doing art' part, it gets tricky and that's something writing just doesn't have. I'm just going to name a few of the things an artist making a drawing has to consider. Perspective and camera angle which dramatically influences the effects of the drawing and takes a lot of experience to master. The ability to break down body parts into shapes so you can easily build any pose you want which brings us to... Poses. You need to learn many poses and how they work with the overall flow of the drawing and the mood you want to convey. You need to know how to show emotion through body language and facial expression. You need to consider that there is a lot of room between realistic and stylized art where there is no right and wrong but preferances done to put a focus on a certain part of the drawing or just because it's 'your style' (but even that takes a lot of time to grow). Unlike with writing where there is often a rule that clearly states what works and what's just a beginner mistake, art has a lot of freedom. Editing mistakes can be impossible at certain stages while you can rewrite anything and everything if you need to. Draw with Ink, make a wrong line and you can start over. It's really that cruel.
Moving on, there is colour to consider, the way the light interacts with the objects and people you draw which is not easy to learn and understand either and, unlike with writing, it does matter a whole bunch what tools you have and how well you can use them for your objective. Using watercolors or a digital art program for example.
I could go on like this, drawing|painting has so many more layers than written art which makes it a lot harder and more difficult to learn. I have time and again tried to get better, learning stuff but even more so learning more and more about what I still don't know, what I still can't do. That's why art is so frustrating too and I completely understand you here Stardust. I'm really glad that you were able to find the courage to upload your drawing in the end and I hope that you will continue to walk the hard path of an artist, yep yep yep
Disclaimer: This is a response to Stardust and his struggles which I share wholeheartedly. I am going through the same thing every time I pick up a pencil.