For some reason I couldn't stop laughing after reading this. :-D
That's good.
To Leosiso,
The reason you haven't received the right answer yet is that you've given no context. This is very important. Since you're a new poster, I'll ignore that, and write a more useful response.
Figuratively, "to step into the picture" means "to begin participating in something". Some examples might help:
"I was getting somewhere with Mary, until you stepped into the picture." (I was progressing well in my endeavours to court Mary, until you - an obviously superior man - appeared as a competitor for her attentions.)
"Timmy's stepfather thought he was bonding well with the child until his real father stepped back into the picture." (Similar concept to above).
"There aren't many good candidates for the election, but there's still time for talented people to step into the picture."