1) Import the following file:
View attachment Painting.mdx
Go the Import Manager, go to File -> Import File.
2) Go to Object Editor, Destructible tab and select a destructible (Whatever you want), right click it and select copy. Then either press Ctrl + V or go to Edit -> Paste or right click a random destructible and select paste.
3) Go to the custom destructible you just made and go to the field "Art - Model". Change the path of the model to the imported model.
4) Go to Art - Replaceable Texture ID and set it to 11.
5) In the "Art - Replaceable Texture Files" field is where you will get the texture for your painting. If the texture you want is already in the engine, you will type the path for it; else, import your texture and select it via the "Import" field.
If for example you type the path ReplaceableTextures\CommandButtons\BTNRifleman.blp, then, the painting will receive the icon of the Riffleman. To check the path you want, get either Warcaft III Viewer or Power MPQ.
Credits to Judash137 for the model.
References:
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http://www.hiveworkshop.com/forums/tools.php?id=rgy4bk
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http://www.hiveworkshop.com/forums/tools.php?id=d5w2va (This only works for windows, if you want a Mac-compatible, just direct yourself here:
http://www.hiveworkshop.com/forums/tools.php) and visit the "MPQ" section.
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http://www.hiveworkshop.com/forums/general-mapping-tutorials-278/how-import-icon-7287/