this is a quick project that you can do to create a poster image size painting from a small image. I decided to do a portrait, but this will work for any image.
what you need:
-a photograph (preferably on 8.5 x 11 in. size paper)
-large piece of paper (bristol board) 20 x 24 in. and up
-black ink (or paint)
I decided to use my daughter's photo - I chose this photo because of her expression. In Photoshop I took the colour photo and turned it to a black and white image - in the Photoshop program you go to filter - artistic - cut out. This will give you the image that I got from my photo. If you don't have Photoshop you can use a free onine photo editor like picnik.com or one could find a stock image on the internet.
take the image print out and draw a grid on the photo using the pencil and ruler.
do the same on the large piece of paper (to figure out what size square grid to put on the large image I divided 8 into 20 and got 2.5 - by doing this I was able to maximize my paper usage - if you don't do this you might have left over squares - which you could easily trip off) - try not to make your pencil lines too dark or else when you erase them they will still be noticeable.
the grid is a method used to enlarge images
follow each grid on the photo and how it corresponds to the larger sheet - it's good to look at each image in the grid squares as shapes and not think too much of the whole picture - if it helps for the more complicated shapes like the eyes you can divide the square to smaller ones - this will help you with more exact drawing.
continue throughout the drawing till the entire image is complete.
take the black ink and proceed to fill in the drawing - you can also use paint.
take the eraser and erase all the pencil lines on the poster.
give it a try and enjoy!