I am concerned that the image may already be in use. Is there a way for me to check that out?
Sadly no. While you might be able to pry an opinion from one or more of the established heraldic authorities (College of Arms, Lord Lyon's Office etc) it could cost you both time and money and would then only tell you that the badge is/isn't in use in their jurisdiction. You could never be entirely certain that it wasn't in use world-wide.
My advice would be to concentrate on coming up with a badge that is both good heraldry and as original as you can make it. Try encircling what you have already with a wreath of flowers that have meaning for you (the State flower, something your grandma loved, whatever strikes your fancy). Consider having the griffon couped - just the top half, which will have the advantage of centralising the rose more.
My own badge, which will shortly be granted by the College of Arms, includes a wreath of
Trientalis Europaea. It is quite an insignificant flower but means a lot to me personally. Twelve of those with leaves make a perfect frame for the rest of my badge. No copying please!
http://en.wikipedia.org/wiki/Trientalis_europaea