It really looks awesome in dark colors; the design is not looking impressive in light colors.
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Tattoo Equipment

It is a good design and it really looks cool on you, it is better to make this in dark colors. If you are not sure with this design, then it is good to make this as temporary.
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Tattoo Supplies

The skull tattoo is looking better with rose, the concept is unique but it is better to use the design as temporary.

The rock has a decent tattoo on his shoulder, that design looks awesome on him.
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Tattoo Supplies

Body part depends on the size like if the size of your logo design is small then it will look cool on ankle or wrist and if the size is big then it will look better on back.

I think the first option is very good “a pocket watch holding by your hands” and top of your back will be great place to draw this design. I think you should also draw the name of your baby just below the design.

A very nice tattoo but it looks more beautiful when you completely fill it with colors, use the same colors.