Kaiseto:

Thank you for the tips, and well, this is an old p.a, because of this, the dithering is bad. .-.

Sorry for my bad english. D:

I rap fast like shadowfax...

It's easy to pick on high color count, because it's easy to identify when something uses far too many colors. This piece doesn't seem to be a high color picture, but the specs show otherwise. I think it's useful to see the palette laid out like this. You have a lot of near-duplicate colors, and I think this is largely a side effect of not considering your overall palette. Individual pieces of this have been designed separately, without looking at what the other parts have already used for colors. It's good to notice these things, because keeping a strong, consistent palette across the whole picture tends to create a more visually interesting and pleasing piece.

We've also got to talk about dithering. As a rule, I'd say don't do it except in the following cases:

• You need to add a specific texture to a part of your artwork
• You are trying to conserve colors, and you need a smooth gradient between a harsher color boundary
• You are very experienced at dithering, and know intuitively when to apply it

Dithering is tough. When applied properly, it can look great, but it's very easy to make a gritty, grainy and ugly looking picture by applying it poorly. Your sky is an example of dithering that is applied with the right idea in mind (creating a gradient between a couple colors), but is done poorly. The dithering shouldn't run into each other. It should fade out to a flat color, then start fading back in to the next part of the gradient. I made a quick and dirty edit to demonstrate what I mean.

I hope some of this is helpful, and you take it to heart. There are a lot of things you should learn and practice, but there are lots of resources out there. Derek Yu did a good tutorial, and I made one a few years back for a college course.

 I was thinking in the dithering of the tower, i was wishing making a good tower here, but the house and the grass, what do you think?Sorry, i am using the translate, because i don't know how to speak a "good" english. D:

what was the whole point of using dithering on this. it makes no sense to jam 141 colors on this it makes me think you simply took the floor tiles from somewhere else and wasted 10mins in paint scribling the rest of the picture.