Do you honestly want to keep a reminder to improve your self esteem on the side of your foot? Really?
It will need re-touching a LOT in that area, the skin is thin and the tattoo will fade quickly. You'll have to keep going back to keep it looking nice and legible.
Crosses... well, unless you're religious I'm not a big fan. It's the symbol of an enormous religion that personally I wouldn't feel comfortable affiliation myself with, but that's me not you. It's nice and simple. I'm getting one in that place myself.
The Grace... do you know someone called Grace? I don't get it... seems like a generic tattoo to me. Bit unimaginative.
Why don't you get something original? Do you really want to be permanently marked with generic tattoos?
Ok I think if you're worried about tatoos more than weight you should be already an eye candy. I personally don't get impressed by tatoos and I honestly believe you're better off without them. Although, I have to admit, those are some of the best i've ever seen, but I also belive you don't need them to look great, nor will they improve anything.
These other people have them. They're just kinda trendy and unoriginal. My rule is that if I find something extremely similar online, I won't get it. I'm an artist. I love originality. Having someone else's tattoos isn't interesting to me. All my tattoos are my own designs... and are larger, colorful and VERY meaningful. Tattoos shouldn't be trendy, they should be special. But... that's just my VERY strong opinion!! Oh well...
Those certainly are attractive, but the tattoo of the world map may be a tattoo you might regret since it doesn't really have a meaning to it and it's also on the back, a place you can't cover up well~ :P