Your hair actually doesn't look that bad. Straigtening takes skill especially with hair as curly as yours. Before I got TR, straightening was a two day process if I did it myself. I would first do it and it would look like yours. Straight but not quite right. I would then pull it back into a tight bun for a few hours or overnight. Then the next morning, I would run the flat iron through it again. On the second day, it would finally look better. It would also help to have too much product like a pomade or something in it. Buying the Sedu helped a lot but I still didn't get perfect hair the first try.
There is a product called Cream Shine by either essations or cessations that my stylist recommended for me. It's kinda heavy and greasy but it helped me when flat ironing before TR.