Thank you for your opinion.
Well the model uses handdrawn custom textures and it is part of my models for my maps, I only use my own models and textures and that is the reason for it having it's own custom texture.
Also, by now the KB limit is not really in any way interesting, since we have this
http://www.hiveworkshop.com/forums/tools-560/warcraft-iii-bypass-map-file-size-limit-ver-6-a-259571/
+WC3 Textures are except for a few far worse than these textures. Meaning a far smaller level of detail and a far less appealing color scheme, at least to me. When you say the custom texture is of a low quality anything that I can think of what that can mean is that it is in a comic style and is not trying to be photo realistic.
ALSO, if you want it with standart textures, just go open it in mdlvis and map it all the way you want.