First off, post this in the photography forum. Some of those guys really know their stuff. Alot better than what I can offer, but anyway. The regular lights in your house give it that yellow look. To take pics inside you would need to get an external flash or set up a mini studio like lamp I think. You could always buy photoshop elements, cheaper than regular photoshop, and do the color corrections that way. If you can shoot outdoors that would be best as this would give you true colors. I have taken a few photo classes and youd be surprised at how much your eyes lie to you about color. I hope you dont mind but I took your pic into photoshop and quickly did some color corrections to it. Is this how it looks to you? Again, try the photo forum. They have years of experience and will be much more helpful than this.
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Occupants not paying rent:
1.1. balls
1.1 corns
1 everglades rat
1 w. hognose
1 bearded dragon
2.1 cats