What you are wanting to do is called parallax mapping.
Various tutorials on the subject can be found on youtube.
The main things are this,
1) Since you are using MV, the dimensions of the image, needs to correspond with a 48 X 48 pixel grid maps. So for example 10 square by 10 square Map, should be 480 pixels by 480 pixels.
2) Since you want the whole map to be a single image, you'll to need to calculate how large you want the maps to be, & adjust the image size accordingly. Then insert the image into your parallax folder.
3) I recommend you create a tile set to use on these parallax images, & then import an image file that is 768 X 768, use that image file i the B, C, D, or E tab. The image should have multiple rows on it. The odd numbered rows should have be divided into 48 x 48 squares, with notes on then to indicate the properties of the 48 x 48 tiles directly below them in the even numbered rows. The even rows should be completely empty.
On each of the empty 48 x 48 squares, you should have different traits, & make sure you have one of each possible type of traits you can assign to a tile square. The purpose of the image is to give you an at glance notes to remind you of the properties of each of the transparent squares, rather than having to cycle through the various tabs, to check all the properties.
4) Once you have your parallax tile set, assign your image as the parallax to the map you want on it. Then use the tile set with the transparent rows, & use those transparent tiles to assign properties to each of the 48 x 48 squares. I recommend you move square by square, row by row, from the top left, to the bottom right. That way you don't have to worry about missing any of the tiles.