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The retina is the photoreceptors in the very back of your eye. I would expect that your eye pencil didn't make it all the way back there :). It is more likely that you poked yourself in the cornea, which is the clear, front part of the eye.
Since you are not having any pain it is very unlikely that you caused a corneal abrasion. A corneal abrasion is where you scrape off the skin that is on your cornea. When this happens, like anytime you break the skin on your body, you have a greater risk of getting a bacterial infection. It is also very painful. This would be treated with antibiotic drops, such as vigamox, one drop 4x/day for 7 days.
All that being said, and after consulting with a local expert on eye pencils (my wife), I believe you will be OK just using natural tears eye drops to soothe your eye.
The red mark may be a bruise on your conjuctiva where a small blood vessel broke when you poked yourself. This will cause no problems in the long run and, like a bruise elsewhere, will take a few weeks to go away. Why is this bruise red when all others are purple? That is because the skin over your eye is very, very thin so you can see the red of the blood better then you would through the thick skin on my arm.
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