Hi! Thanks a lot for your suggestions.
You are right about the message in exporting the skull.. I know i should have either added the possibility to export it, or add a message, but i simply didn't think of that! I'm a lone programmer and i do this on my free time, so it's not easy to have everything in mind! Sometimes i just have my mind in what is the tool meant for and it's hard to see beyond it.
About the preview, it was first requested to me as a feature in version 1.4, so i'm adding it in version 1.5 that i hope i can release today. This tool was initially intended for generating maps and using them ingame in shaders for my personal use, so i didn't think it was useful. However, when i released 1.4, some people suggested i should add it and i did! But for next release.
So stay tuned and get version 1.5 where (i hope) this problems will be solved!