I was in your shoes once my friend. When I was courting my GF (best friend back then), I spend alot of time with her. Going out for movies alone. Sharing jokes, playing the same sports..etc. After almost 2 years, I started having feelings for her and treated her differently and became a little more tuned into her emotions and her needs. IF she was a girl, she would definitely know that I have special feelings for her after how i've treated her. And yet we still went on and she's still okay with everything we did still. It was that, that gave me the courage to go and ask her. All this while she knew I liked her and she hasn't distanced herself but instead returning subtle signs at me and still enjoying my company. Since then, i've no regrets and i'm glad i took that leap of faith.

I hope my experience help you in a way to overcome that thought of being rejected. Put it this way, by giving her that portrait, she would've known that you do like her more than friends and she's still with you, right? What does that tell you? She's being patient with you and until you've not made a move, she might just move on and you will miss that flight forever. Good luck mate.

Yes, we're still together and best years have yet to come.