Strength in Chinese tattoo
People looking up strength in chinese tattoo usually want one clear word. Duane checked the reading below. It is not a stencil made for you.
If you mean brave, see courage in Chinese tattoo.
Characters
Simplified characters are the everyday writing in mainland China and Singapore. Traditional characters are used in Taiwan and Hong Kong, and in classic calligraphy, including 欧体.
For this word, the simplified and traditional forms look the same.

Simplified and traditional look the same here.
The picture is set in LXGW WenKai, an open regular-script font. It is not Duane's brush writing. You can download it as a stencil of this reading. For your own words or name, use the form.
Meaning
Strength as a noun, the power to do something or to hold on. It is two characters. 力 alone means force. 強 means strong, which describes someone. It is not the noun strength.
Common mistakes
A single 力 is the usual mistake. It is a real character and a thin tattoo. 强 is the simplified form of 強. Neither character means the noun strength by itself.
Before you tattoo this
Physical strength, inner strength, and the strength to endure are different. If you mean brave, that is courage, not this word.
Want this in your own words or name? Tell Duane the meaning you're after.