I've never been an amazing artist but I do enjoy turning my hand to the paper occasionally. As a kid I was always doodling and drawing, but 99% of the time my subject matter was horses (being a horse mad teen) and as such as my art skill in other areas has never really gone anywhere...
Some of my older work:
Sorry for the crappy BB pic, this is one that I'm currently working on:
Basically I'd like some advice on how to broaden my skills from just crappy horses to actual... I dunno, art work?!
Get a small sketch pad and sketch people on the bus. You are lucky you can do horses! I've never gotten the hang of animals, apart from cats. But then again cats sit still for very long periods of time and are the perfect life model.
Practice drawing things directly observed. You could try setting up your own still life and sketching it from a variety of angles. Or set up a mirror and create a self portrait. Go outside and observe the nature. Practice a wide variety of different subjects and develop your work based on what you feel most inspired by. Good luck!