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I've been putting loads of sunscreen on it since we've been getting a lot of sun the past few weeks. 
I am coming to understand and accept that tattoos are inherently imperfect and with that perspective I am learning to love mine for what it is, instead of what I wanted it to be.  Also I did some reading and I think I'm still in the phase of healing where there is a layer of dead skin over the tattoo since it still feels raised and looks cloudy.  I'm hoping when the healing is 100% done some of the original color and sharpness will rise to the surface.
Thanks for all the helpful advice!

https://www.quora.com/What-color-does-the-combination-of-brown-and-green-make

https://www.quora.com/What-color-does-the-combination-of-brown-and-green-make

Everyone is different, but it generally takes 6 months for a full heal. Give it time.

Is it just the picture or do you have some suntan on your arm in the second picture? Remember that you have a layer of skin cells now regrown over your tattoo and that will change the appearance - and if it is tanned it will change it even more.
Certainly, our bodies all react differently to the ink injected during tattooing and one's skin pigment will affect the colors to some degree. I had problems with red ink - my body seemed to absorb it in places so it took some touch up and I still have a few small places where it's not as saturated...but tattoos aren't perfect, they're handmade art.

Tattoo looks totally fine and seems to be healing very well. The lightening of the colors is totally normal as the ink is now under a layer of new skin. Looks totally and completely normal. 

Welcome! As Dan said you're going through normal healing - and it can take up to 6 months to fully heal. Have you talked to your artist about your concerns?

looks like a normal healing for what it is to me,that's what happens to tattoos,they NEVER again look like they did the day they were applied.
and also this new "water color" style does not hold up as well as bold saturated colors with outlines.

I've been putting loads of sunscreen on it since we've been getting a lot of sun the past few weeks. 
I am coming to understand and accept that tattoos are inherently imperfect and with that perspective I am learning to love mine for what it is, instead of what I wanted it to be.  Also I did some reading and I think I'm still in the phase of healing where there is a layer of dead skin over the tattoo since it still feels raised and looks cloudy.  I'm hoping when the healing is 100% done some of the original color and sharpness will rise to the surface.
Thanks for all the helpful advice!