Colors are good and natural. Overall it is a nice image and a pleasant change from the darker themes of most of the images. The clarity of the hands and beer cans and bottles is good. Choosing to capture a toast is a great idea. It implies a fun twist on the "dark" (dark beer, that is) challenge theme.
Compositionally the wall with the flower holder may not be the best choice for a background. It has too much non-dark beer related interest that draws the viewer's attention away from the main subject. A less busy background would be worth considering.
Though the rest of the exposure is very good the white of the table cloth is overexposed and almost hurts the eye to look at. It is very distracting to the rest of the image. The spillage on the lower right looks more like dirt than the result of having a good time.
Don't like the hanging basket in the corner but love that your shot isn't like the other 99%. Well composed. looks like ya spilled some in the bottom left. PARTY FOUL!!!
Beautiful crispness, the white seems just a shade blown out on the left side and the shadows on the right unbalance it as well, if it was toned a bit down on the left and brightened a bit on the right I think it'd be perfect. The colors work really well together, the white with the darkness of the guinness and the rust color of the brick is nice. I think as another suggestion I would crop the image at the top right below that first flower, or if possible swap in a basket with ONLY greenery, no colorful flowers, they distract my eye away from the subject and the colors don't quite match the look of the rest of the image. Other than the fact that guinness is soooo gross tasting, I've no other comments! :) Very nice. I gave a 6