Aww, too kind. I've just been plugging away at it for about twenty years. I should like to SEE what I can do in another millenium or so.
I use martial arts and dance photography as my reference points for nearly all of my figurative work, and for my Predator drawing in particular. I like to draw muscles, and I like to draw exaggerated poses without necessarily going all comic-book-steroid-pumped-super-hero on the ideas.
Learning to color is just a matter of looking at the colored stuff you like and trying to mimic the effects. You might start with cel-style shading, which tends to be a bit simpler. Or just study the paintings and illustrations that you like - in minute detail. That's how I figured stuff out, too.
Oh yes... You'll need several shot-glasses full of patience. Even if it's just in fifteen-minute intervals (which is sometimes what I'm stuck with), as long as you're working at it, the color knowledge will come to you. I've been hard at it for almost twenty years, and I know there are always new tricks and effects to learn. Don't pay attention to the passage of time. Only pay attention to what you can do at the end of the day that you couldn't do when you woke up.
I use several different sizes of pens when I do my inking. I go over the pencil lines with a thin-tipped pen first, then I erase the pencil. I go over the parts that I want to emphasize or bring forward with a much thicker pen.
The fan base has pretty much filled in that gap. Gods-gifts and magic and psychic powers - all that stuff that rounds out a culture properly. Too bad the comics and novels haven't played with it very much, though. I've been waiting fifteen years for some canon Predator black magic to shake things up a bit.
I imagined things substantially more alien (well, I would have if I'd thought a little harder about it first!) - great reptilian-insectoid critters with lots of layered mouthparts, or something fun like that.