Its OK to use photoshop editing apps...photo editing is form of art...just categorize your uploads accordingly when you are in the submission process.
Don't be lazy and choose the same category every single time you submit a deviation. And DO NOT lie on purpose to look good. You cannot convince us...we are experts and we know better. You can't fool us, except yourself. Eventually DeviantArt will MOVE and re~categorize your submissions themselves or WORSE you are just going to end~up getting yourself banned from being stubborn and foolish.