All these WIPs look superb! I really have no words to express the quality of your work and your style...

You are a beast!

I'd love to see an airship in the first scene. Also, more sidescroller tiles.

I'm enjoying it, i waiting for the result

Your workflow isn't really optimal. I used to rely guidelines to do all of my anatomy (via being mislead by anime drawing guides including ones by Chris Hart *shudders*). If you apply such a workflow with pixel art, you're naturally going to work larger for more readable sketch work. Larger works will eat up time due to the large number of pixels necessary to polish. Personally, I sketch not with line, but with my fill color.

I don't know many resources on workflow but I remember this particular post from pixelation: http://www.wayofthepixel.net/index.php?topic=15092.msg139385#msg139385 It should suggest an alternate workflow which I believe is a very solid workflow.

Only once I learned about how to actually improve with anatomy, I learned that guidelines are useful only if you understand the anatomy. So far, your work is all very cartoony and much of the rendering is done with symbols. Cartoon art styles are very handy as anatomical quirks are gonna be less noticable. This something a cartoonist would want as it will allow the sort of freedom necessary to create a more memorable character (heck, Timmy's dad from Fairly odd Parents has a nose placed on his cheek but they were skillful about it). Some of the things I'm seeing don't seem intentional and doesn't seem to add anything obvious to the character. Your work has a lot of character which is often missing in a lot of works I've seen (at least I'm assuming they aren't fan works), but there are some things I'm seeing when I take a closer look.

For the girl in the indigo-hued dress, her hands have four fingers (though not sure if intentional like Ed Edd n' Eddy). Her upper and lower legs are oddly sized. Her feet are different sizes. Her breasts are placed too high. I personally can't figure out what the bone structure in her hips look like. Her figure is also balanced oddly. Luckily, if we sketched out the entire body first, this mistake would be more easily noticable before you added significant polish which has to be tossed out.

Your lizard has some pretty weird leg anatomy. If you were to think about what its bone structure underneath looks like, what does it look like? Also, there could be more negative space to separate the legs for the sake of avoiding visual tangents. If there's no negative space between two objects and they're touching, it flattens your composition.

Your highlighting is creating many, many light sources especially with the girl in indigo. Highlights appear where they are for a perfectly explainable reason - they are places where light directly bounces toward the viewer's eye like a mirror. Observe real life to see this in action, and more importantly, see why some textures have no highlights. Skin for example has weak highlights; they do not have bright highlights. Also read into the physical science behind (light) waves so you can get a better sense of why lighting appears as they do and not what we think they do. Not only that, but be sure to train your eye to be able to do realism. That means, not drawing with line but only with blobs of color.

Again, as a whole, your art is anything but boring to look at but it's the little things that starts to make things a bit awkward.