What Makes A Good Submission/The Textures Resource
The Texture
The Texture Format
Textures should be submitted in the PNG format. This is due to the fact that it is a lossless format, so it never decreased the quality of the image. Most of the time, we do not accept any other format other than PNG. As well, GIF is another lossy format that is not accepted, as it loses colors and only supports 256 colors. However, there is only one other time that you may have to submit another format, which is the JPG format. Some older games tend to default their texture format to JPG. As JPG is a lossy format, you are required to leave the images in the JPG format, as converting them to PNG will cause quality reduction.
Texture Transparencies
If a texture has transparencies, don't remove them. The textures are applied to the model and removing them can make applying them harder.