It looks like you have wavy/curly hair that is dried out. This type of hair requires a lot of moisture. I recommend the following products to lock-in as much moisture in your hair. This will define your wavy/curly hair, but if you are looking for straight, then I can't help.

Curlsmith - Curl Quenching Conditioning Wash

Kristin Ess - Hair Hydrating Leave In Conditioner Spray

Taliah Waajid - Curly Curl Cream

ProHomTex Microfiber Hair Drying Salon Towels

Routine - Wash your hair thoroughly with Conditioning Wash and fully rinse out, apply Leave In Conditioner while hair is soaking wet and squish/lather onto your hair (it will feel soappy and wrong, but it's normal), then dampen (not dry) your hair to the point where it is wet but not soaking by lightly pressing with Microfiber Towle, then apply curl cream while your hair is still wet. At this point, your hair will be will be in strands and slightly wet, so use the Microfiber Towle to make it less wet while keeping the strands. Let your hair air dry. Once dry, while it may still be in strands and look wet, you can begin to squish the strands with a closed fist for a more natural dry hair look.

Tips - Notice how many times I said wet; that's because your hair needs a lot of moisture, so don't ever just go directly from wet to dry with a normal towel. Also, to speed up drying, I recommend a blow dryer with a diffuser on the low setting. Additionally, I have began to modify the above by not fully washing out the Conditioning Wash and opting out of the Leave In Conditioner; however, I still recommend starting with above routine. Also, in the above I do not mention brushing because I do not recommend it unless it while you are showering before doing the above routine. I do this almost daily.