In what way are you visually challenged? Color-blind? Informing us might help us suggest ways to overcome it. Or was the thread title meant more tongue-in-cheek? I often jokingly say I'm musically-challenged, but I don't have any real hearing impairment other than a lack of experience and exposure to music (driven by a lack of real interest). Is that what you mean, or is there a physical problem you're having to work around?
As a technical person with no natural skill in art, I can relate. With my own work, it really is that the more I've done it, the better I've gotten. My original art was really terrible, but I accidentally put myself in a position where I was required to make alot of tile-art, and over the years the art has improved alot. This is one of those areas where you really do need to put in your 10,000 hours of practice.
Following tutorials helps somewhat, but no tutorial will make you a skilled artist unless you also put in alot of practice. Unless you have innate art skills (which alot of people seem to!), you can't just start doing and expect to make awesome art overnight, or even in so short a time as several months. You should notice your art getting better, from month to month, but you probably won't be able to just churn out really great art for a year or so. At least, I couldn't!
When you say you've tried to follow tutorials but "it just doesn't seem to be working for me", do you mean you've only been working at it for a few weeks, or do you mean you've already been trying hard for a few years? There is no shortcut to actually putting in the 10,000 hours of practice it (supposedly) takes to master a skill. Even if you're not wanting to 'master' it, and just become semi-competent in it, that still requires more than a few weeks of dabbling around.