437179 Photo Collage

I have lots of photos from my last holiday. I would like you to create a digital photo collage of selected photos. It must be done in a professional way; I know the programs who do this automatically and I am not interested in this quality. I will tell you which photos must be bigger and which smaller. The photos are made with 14 megapixel camera so quality is sufficient. If you bid, pls tell me which techniques you plan to use. The final result must be in a way that I can have a format of 50 x 50 cm printed on canvas. You just have to deliver the digital file.