Search by drawing is a pretty unique feature at GazoPa.com. Since our image search is based on similarity, images can be searched by your drawing. If your image search only enables you to search for same photos, your drawing would not be regarded as similar to photos, because a drawing is totally different from a photo. Search by drawing is a unique feature of similarity based image search.
Default of search by drawing is a shape option, so images that have similar shape would be displayed at first. So if you are not satisfied with results, please try other search option such as layout and standard, because these options use color together with shape.