Use a body brush once a day, and brush in long strokes up towards the heart: this evens out any cellulite and improves circulation in your body for smooth, glowing skin.
If you want to try liquid eyeliner, a good place to start would be using a felt-tip. They're great for beginners because they're easy to control and give a sharp, tidy line, unlike kohl. I've been wearing eyeliner for nearly two years though, and I still use L'Oreal Superliner Perfect Slim felt-tip!
If you're short on products and on the move, you can apply lipstick with a finger, and then use the residue on your finger as a blusher.
Pertaining to a skincare routine, there is something different for everyone, but I exfoliate my face three times a week. This gets rid of any dead skin cells on the surface of your face, and like the body brushing, improves your circulation, giving skin a nice glow. After exfoliating, splash face with cold water (this closes up your pores) and use a cleanser to get rid of any stray dirt - I use Clean & Clear Deep Cleansing Lotion. (I use this on its own if I don't exfoliate beforehand - it replaces a face wash for me). Then, moisturise your face - you should have a separate cream for day and night-time. A separate eye cream also won't go amiss, as the skin around eyes is very sensitive! The day cream should have at least SPF 15; this will protect your skin from the sun and prevent premature ageing. Maybe talk to a beauty consultant in Boots or something, they'll usually help you find skincare products suited to your skin.
Break a sweat at least three times a week. Toxins will come out of the sweat and effectively 'detox' your skin. Just remember to wash your face and body after!
The most important beauty hack, however, is just drink plenty of still water. I swear by it.