Default [Q] How to improve Snapchat photos quality?

Sometimes the photos that I send with Snapchat becomes to have poor quality compared to another people with iPhones or something like that.

My smartphone is a Xperia L, with 8MP cam and KK 4.4.4.

I believe that its something about DPI, because my display have 4.3" and my screen 854x480.

Can someone help me?
DEVICES

Sony Xperia L C2104 Taoshan
AOSPA KK [4.4.4]

Samsung Galaxy Tab 2 10.1 P5100
CyanogenMod 11 [4.4.2]

--------------------------------------------------

OLD DEVICES

Motorola Razr D3 XT920 [SOLD]
Sony Xperia U ST25a [MOM'S]
Motorola Spice XT300 [BROKEN]