I am a real N00b

. This is my first attempt at making a map in Gmax. I am using Gmax and Photoshop but other than that have followed the tutorials. I have made my skybox, but whenever I try to add my texture to it, I find the texture does not look like my drawing. It is only half of my texture and all the colours are strange. The yellows are green, the greens are purple

. I have got it slightly better by setting the paintbrush hardness to 100% but it still looks crap. Please help me, and if this is a n00b question feel free to flame, but please just help me.