There isn't any real way to tell if you have a bearing problem or not from a photo, the color or even a little rust may have had no effect on them at all. Living in an area of the country that is humid you will often have a bit of a rust problem. Like Kool stated, I would at least run my engines empty at the end of the day. I'm not a big fan of after run oil but it doesn't hurt to give the engine a little shot at the end of the day. I would just clean your engine and put it back together and give it a try. Just oil up the bearings and give them a twirl then flush them with alcohol and oil them up again. If they are bad you can feel them grinding. Don't get too freaked over a little rust, it isn't the end of the world, clean it up and give it a try.