Mixing images resulting in drab colours?

Hopefully someone can explain what attributes I need to modify in the
following code to stop my bright green bricks that are mixed with
text turning into very dark green bricks. I've attempted setting
R, G , B, values of various pieces of code unsuccessfully. Thanks:..

Edited....

regards, BP.

Your code doesn't work. If you post some working code, I'd be happy to help you.

Cheers fred, I'll rehash what I submitted...