Wow, some pretty interesting post-apocalyptic environments. Though some can come across slightly confusing, especially the last one. Pick the direction the light source is coming from, and increase the contrasts, to make the image slightly more eye-catching. The best here compositionally is the second to last piece (the delapidated building), which is a great angle and the use of colour works.
Hi!! Great thread man. Awesome works. I love your jungle themes and jungle characters.
But, to answer your question. (I am assuming you wanted to add a thumb to this thread post for anybody in the sketchbook lounge can see it)
1. You will have to go all the way to the first post and click on edit
2. Then click Go Advance
3. Manage Attachments
4. Now you have to get rid of all the pictures here and just post one pic. You can always edit your second post with all the pics that you removed from the first post (or you can add them wherever).
Hope that helps
Live life, Live love, Love life, then die -- SaiVix
I would really love some honest critiques and improvements suggestions