Character Compositions!

Finished the life drawing and im not going to lie im glad but i did learn a lot about drawing and do feel a lot more confident but i know i would really have to stick at it to get back to feeling free to draw whats in my head and at the moment i was having a lot more success with 3D work! but getting hack onto topic i have been working on some compositions for my character to be involved with. basically what this means is taking a image of a real place then comping into this fake or computer generated objects but trying to make it look like they are really supposed be there. here are a few examples from youtube that you can go and have a look at. ill upload my attempts later.

http://www.youtube.com/watch?v=DwD9NcMbBHg

http://www.youtube.com/watch?v=nRb_e99UMKQ

http://www.youtube.com/watch?v=7dK46EVnCOI

http://www.youtube.com/watch?v=0h7dSIf7vug