Need an advise for promote app

Hi everyone,

I have just released an android application about photo editing. My friends said to me that my app looks very nice, quite smoothly, useful,.. I already spent a little of money that I can to promote by running Adword... but the result is not good..

Now, my app has about 50 - 60 installs per day after stop running Adword.
Could you give me some advise to promote my app ?

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