You are doing a great job! Photographing underwater isn't easy you are juggling so many things, trying to tread water, not down, and take a picture its a lot. I recommend setting your camera to the quick shutter mode and just taking as many photos as you possibly can. As far as photoshop goes I recommend checking out youtube for tutorial videos just make sure to type in the model year of the photoshop your using so all the tools are in the same place but from what you got so far it's turning out really good just keep going you got this!

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