Snapseed is the bomb. Why Google hasn't worked it into their Photos app is beyond me.

 

Frankly speaking, there is no a good mobile version of the photo editor. I mean if, we are speaking about drawing on pictures than yes, there is a ton of app's that can do this perfectly, but if we are talking about a photo editor, there is a little issue. You will not find a good editor with all the necessary tool set for editing a photo. Better to download your photo on your PC or laptop and use a third-party app like softorbits.com This is a perfect editing app for photos, it has all the necessary editing tools and it's free. This is how I am doing, I have brilliant photos, maybe I will upload some here, but a little bit later

 

Sure, the best way is to edit with more professional software, but for almost 95%, of my photo needs, I use this photo editor. It's in the first 5 apps that I install on any new device.