Your composition is fine. The characters and their outfits look good and well rendered. The background is simple but detailed enough to intuit what is going on. You definitely know what you're doing!! I think the light is a bit too intense on the characters though that could be what you were going for. If the characters are vampires then it makes sense for them to be a bit pale. In that case, I would try to add a bit more red to the skin tones to help break up the whites a bit. Look into something called Sub Surface Scattering. Its something that happens when light passes trough semi transparent objects. If you've ever held your finger directly up to a flash light then you know what it is. Consider incorporating a bit of that into the skin rendering. Now this next part is just a me thing but it feels like the blue haired character should be holding a phone or a camera with the flash on. Basically I am advocating for a change of pov if that is something you are open to. Meaning, the current pov is through the eyes of the camera being wielded by a photographer. In other words its a first person pov. Instead, shifting the source of the camera from the viewer to the blue haired characters hand changes the pov to that of an outside observer capturing a moment. Thats just my purley biased opinion! As stated before, your composition is good (even great) as is. All in all this is an excellent painting! I totally buy that these two are friends at some party having a great time. It's probably a small party but a party none the less which makes the composition all the more intimate if you think about it. Please feel free to critique my artwork as well! I'm new and am just trying to contribute to the community and improve my own skills! Good luck to you