I really like those small dragons, it is awesome perspective! 

Thanks. I must admit, I'm also more happy with the left hand corner than the rest of the image. But I will definitely do more, so there will be ample opportunities to improve :)

the bottom left hand corner is so good.  I LOVE the coloring of the hooded man.  I dislike the lightning. 

I hope you continue to do some more like these

Thanks, Manupix. Your observations are all valid. To answer your question, I imagined that the sun (dimmed by rain and clouds overhead) is the main light source. It's not mid-day, but still bright enough that everything isn't just a shade of blue. When the weather is like this, on a very cloudy day, I find that objects don't really have a defined shadow, so the clear shadow from the robed person is actually from the secondary light source, the lightning. I suppose it's too short for that, because the lightning is so low on the horizon.

At this point, one might ask why the tree casts a shadow directly below, instead of having a long shadow like the robed person. Of course, it is possible to have multiple shadows from multiple lights, as can be seen when standing on a football stadium with bright lights, but that doesn't quite solve the problems here. Clearly a mistake on my part.

I'll definitely keep experimenting with multiple light sources. Even though it's very challenging, it's a lot more fun to pixel and also more interesting to look at (if done right!)

Lovely scene, nice colors!

As you know, there are issues with contrast and light...

The dragons, the person's back and staff, and the pot are unnaturally darker than any other part, including what should be deep shadows (underside of tree, mostly).
If the dragons are huge and far away, they should themselves be somewhat affected by aerial persp; or else they are small and near.
 

I thought the lightning was the main light source too, because of the cast shadow behind the guy. I understand from your comments that's not the case, so what makes this shadow? His lantern is much too weak, and would not cast such a shadow. This is actually a high sun shadow.
Unless you want to make the lantern blindingly bright, you might as well forget the shadow, which isn't that interesting in the composition anyway.
The fire should also cast some bright glow in its close proximity, at least on the log tips.

 Oh I thought it was a scene in night time, and the lgithting was one of the main light sources.

I see what you're saying. But I don't think distant clouds are dark blue at day. Again, I refer to the links below and pictures such as this. If you still don't agree, I guess we'll agree to disagree.

I do agree that the lighting could be better. The lightning was added as an afterthought and I didn't really want it to dominate the piece. In retrospect, the colours of the trees, the robes and the mushroom do perhaps not reflect the rain soaked atmosphere.

Oh well.

 See, when something is far, such as a mountain, and you look at it, it appears not to be brown such as rocks, but some type of purple color. That applies to clouds as well, but they usually change from white to some type of darker colors, in day, they change to a mid-dark blue, but at night, they change to dark purple or dark blue. And by light sources, I mean that there are lots of it, the pot in the fire, the lightning an d the candle, this light source shoudl definatly change many colors.

Thanks for your comment! Unfortunately, I don't quite understand what you mean. Are you saying that the clouds should be darker, because they're far away? If so, then I recommend that you check out this WIP thread and this Wikipedia article. I think you'll find that you're wrong - though, to be fair, I've made the same mistake myself.

Could you point to some parts in specific that have a conflicting light source? The intention was to have the light source on the right side, except for the second light source from the lightning.

 The distance from the cliff and the clouds isn't very accurate because of the colors, when something is far, the colors seem to get darker, in this case, the clouds should be some type of dark purple or blue. and your light sources are kinda confusing me.

Thanks for your comments, guys! Much appreciated.

@DawnBringer: Of course, now that you point it out, I absolutely agree. I'll try to play around with the contrast and see about creating sharper shadows.

The cliffs need to be a lot darker (right now they blend with the clouds). Put some more shade around the trunk directly under  the crown of the tree. In general you could increase the contrast of the the whole image and play more with the light from the lightning and give things heavier shadows.

awesome animation on preview, and nice work overall :)

Excellent work! It are pleasant to me that at me never turned out - damned clouds!