Trying to improve your drawing ability is worth the time and effort spent. I have been working on improving my artistic lens for the past month. Am I yet at the skill level I want to be? No. Have I sacrificed a lot of time? No.
I sit down once a day whenever I can find 10 minutes, set a timer, and sketch whatever comes to mind. On busy days I skip this practice, but always make it up in the following days.
You can see the progress in this imgur album: http://imgur.com/a/GTF6w#0 . These are by no means exact representations of the image in my mind at the time. On the other hand, they are quickly getting closer to my imagination everyday.
For a practical book on the topic of drawing, I recommend http://www.amazon.com/The-Drawing-Right-Side-Brain/dp/087477... .Reading that book helped me gain a lot more confidence and understand a lot of the science behind drawing ability.
I also have a large amount of bookmarks on improving your pixel art skill set. If those would be of interest then I am happy to share those links.
Don't give me crap for recommending Photoshop because I use it and think it's bloody amazing with the things it can do.
I seriously recommend you pickup a trial of Photoshop and go through these,
- Learn some fundamentals anyway you can (huge number of tutorials for nearly anything online)
:: If you're doing digital, get a tablet from these guys. Go bamboo if you're not rich.
:: This site teaches you a fair bit about Photoshop and drawing in general.
:: Awesome for tablet owners and if you want to tutorials from professionals. Also has some nice brushes from well known artists.
:: These folks are legendary. They're all over the industry & have some of the best teachers on the web. They cost a bit but it's worth it. Seriously recommended.
:: A real beginner to pro journey where some guy with little experience shares everything as he practices relentlessly. Possibly for the inspiration category...
INSPIRATION : These are great for games but also good for just coming up with a starting point for say, concept art.
But it's art - I can imagine you developing your own style this way, and I'd absolutely have no problem with it.
And I guess it is easier to keep one-sketch-a-day as a habit than feverishly improving single piece to no end.