I'd add at least a few more inches of substrate, as I believe LizardMom pointed out. I would use the heat tape (though I prefer the self-adhesive heatpads) on the right side of your tank since thats the hot side of the tank. The pad will heat the substrate, which will hold the heat until it escapes into the tank (your ambient heat) and you will have the basking light right above to keep that area nice and toasty.
The light and tape will create enough ambient heat to keep the tank at a good temp since you have covered the screen top with alumiunum foil. The light will heat the 'basking area' above the tape even higher to help with digestion. You can use cork bark or some logs to raise some spots to different levels so Otis can choose the temp/level that is best for him.
I'd move the hide so its in the middle of the tank, half in the hot side and half in the cool side. This way Otis can again choose the area in or on the hide he prefers. (Or you could put a hide on both sides)
As far as the eating, egg will often work. I have seen very few Tegus refuse it, but if he does indeed start eating it I would not make it a regular thing because you want him on a standard diet of crickets/mealworms/pinkies (with proper suppliments for the crix & worms). If he eats the egg and really likes it you can drop a boiled egg into the blender on high and put it in a jar with some crickets. After the crickets track all through it and get it all over them, put the crickets in the tank. Otis will taste the egg and start eating the crickets.
As far as the fruit; some, but very few Tegus I have seen, like fruit much when they are young. This is not a strict rule. Mine for example will eat some melon, but not much and not often.
If you need more help I will check back or you can post where you posted Otis pics in the gallery. Handsome boy by the way. 
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Rick
theTegu.com
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