I have been using an app for quite some years now to edit photos. Vsco has really cool filters I like to use. I recently went on a trip to Denver, CO and used the VSCO app to mainly edit my photos. Here are some examples.

Processed with VSCO with c1 preset

Processed with VSCO with g3 preset

Processed with VSCO with f2 preset

I was able to really bring out the blue tones with this app. It also has certain settings that isolate certain parts of a photo to allow you to play around with.

Here is an example of what kind of settings you can use.

You can also share your photos for other people around the world to see. You can also see theirs and see how they used certain filters to make their photo more special.

I recommend this app to novice and expert level photographers. Even if you just take photos for fun this app can really help you get that perfect photo.