The last texture..is probably your problem...I hope you have somthing like photoshop..if you do creat a new document at the approximate size and on the right side of the screen youll see the channels tab..at the bottom of it youll see a small icon for createing a new channel click it and select alpha...here is where you want to put that shape you have in black...now when you view this bitmap normaly it will apear black ...and it needs to be as a 32 bit.tga only this extra 8 bits is the little greyscale image you created in photoshop and what the shader is programed to use for shapeing the sections of the blend ...almost like a cookie cutter..at least this is my understanding i am certianly no expert