It's a good start, but it's more a piece of clip art than a "logo" (that's not meant as an insult). For improvements, you could start with perhaps adding a more defined shadow on the underside of the lemon (it's too bright under there, compared to the highlight). Also, add in some texture to give us the impression that it's a lemon and not a water baloon, egg yolk, or something else. Finally, I'm really picky about things like this so could you centre the text under the lemon just for me?

If you're up for a bit of a challenge (or, more work) why not split the lemon open and show us some of the inside. We could say for sure that it's a lemon then!