1.Put the "Dff files" in to "Modloader" folder. 
  if you don't have "Modloader" you can open the gta3.img from "models" folder using "IMG Factory".
  I'll suggest 1.0 because the other version crashes in some pc

2.If you didn't install any texture mod, just simply drag the "models" folder from "Drag & Drop (Classic)" into your game directory. 
 or if you installed "VRTP" without "modloader", 
 just follow the same way. or if you installed with "modloader" then open "modloader" folder and put the "models" file to "VRTP" folder

3.This step is just for that pepole who installed other graphics mods. 
  First, you have to download and install "Magic TXD" then Open the "generic.txd" file and add "ijb_palmleasf02.tga" and "vegaspalm01_128.tga" file
  and replace the "kbplanter_plants1.tga" file. and that's it :) 

4.just rate my mod if you like :) 