Give a Kiss For Luck?

A very well made and funny piece, it easily achieves the desired effect of Chat being sly and Marrinette not having any of it. I'll start with the critique and go to the praise, take these with a grain of salt since I'm not nearly as good of an artist. There are really only two things that feel off about this picture, Marinette's proportions and Chat's tail. From all I've seen of your artwork, the thing you seem to struggle the most with is proportions and tend to make the heads rather small compared to the body and/or neck and occasionally the limbs to small, though this is somewhat an exception because you nailed Chat's besides a slightly thick neck. Her legs are also off in both size and perspective, but don't worry about doing odd leg poses in the future since I'm assuming that this was a lot more challenging then usual due to the railing. For future drawings of things like that, I would recommend looking at either images of profile views of either real people or profile views drawn by artists specifically for reference, if my many manga drawing books have taught me anything, it's that even professionals use reference images and it only makes the final product better. Now this next one is more of a stylistic thing so don't take it too seriously. The way Chat's tail is moving might be like that just as a cartoony thing, but if it was intended to be in the realm of reality and his tail was flying up like that because he just landed on the balcony, then there should be some tenseness to his hands and legs to create the illusion of the movement of jumping on the balcony. A few teeny nitpicks, but the heart is kinda blocky rather then curved and their pupils don't line up and they aren't looking eachother in the eye.

Now! Onto the good stuff!
I absolutely love how expressive you drew these two even with only half of their faces to work with, I especially love how smug Chat looks about his surprise visit and how you even used Marinet's pigtails to make her look even more done with his antics by making them stiff and a bit more pointed in the 'very angry tsundere' fashion. The highlights, lighting, and shading is very good as usual and give the image a very 'complete' look. I also absolutely love the background, it's very clear what's back there yet all the edges are soft like the background is blurry because it's farther away which is a really good effect that is typically difficult to achieve without muddying the background or spending a year or so on it XD

All in all, a very good artwork that just needs a little refining!