Right off the bat it is very grabbing, good color use and easy to read. The red and the green and the tints and shades of each work well together and against each other create a visually appealing image. Sticking to three solid variants per color keeps things crisp while also providing enough depth for the monster to be believable. The shaky linework does a lot to keep the organic feel of fur without going over the top too much so good work on that, I think maybe a few points it could be crisper like on his left elbow and the top part of his hump, but the positive effect achieved outweighs the small nitpick there. I rally like the little marks on his body, the odd line and pip here and there really help keeping your monster from becoming plasticky
I'm not too big on the title. The green bar feels too saturated and the lettering could be a bit beefier (great work on the stylized title though - very creatively solved). I think a good work around would be scaling up the lettering and making the lines thicker but having the green be a drop shadow so the black is more subtly highlighted by bits of green rather than "hi-liter'd) by it.
The stylization of the clouds could be improved by making them crisper - I think - to match the bear and the city. ALTERNATIVELY you can harken back to older sort of collage style trashy pulp zine styles and have the background skyline and city be more detailed and rendered out (or just use clippings with a black-and-white filter) and have your monster crushing them; it would drastically alter what your drawing is about in terms of type of art but it's something to consider for future drawings.
I'm going back and fourth on whether I like the foreground buildings being blacked out or not, but they should be bigger. the far background buildings are well-colored and show an appropriate amount of distance but the foreground ones are smaller than the background ones, which while not impossible does create issues with the scale. A fun thing to try and do would be puts some buildings way closer to the viewer along the sides to sort of frame the monster and the whole piece. Buildings are great for frames because they do not need to be the same size or distance, they can in this case be partially destroyed and most of all in a head on shot like this the lines of windows when drawn in perspective create a grid and directional lines leading straight to your subject - helping with the flow and composition of the piece as a whole (though I will say you'd need to zoom out a bit to effectively use that space.
Moving a bit further along with the buildings I would say since the monster is standing right in the middle of the city there should be some knocked over buildings, some smoke rising up and maybe some fires on the buildings possibly helicopters or planes on the horizon or around the monster. Also side note the size of this is a bit on the large size, scaling down the picture is usually a good idea for hiding any imperfections - when zoomed in a noticed your buildings definitely lose some crispness that I had liked about them in general unless soething is super intricate and detailed the largest side of your canvas when uploaded to the portal never has to exceed something 2000 pixels.
Overall good job on this one, there's a lot to like for sure, it's a well executed type of simplicity that is crisp and fun, rather than basic and boring. The monster is well drawn and has a really solid color choice that is pushed forward by the washed out colors of the background. While there are some issues with the drawing, like the scale of the buildings and the basic foreground; and some parts of the story side could be more fleshed out with regard to destruction of the city, the issues don't hurt the piece as a whole too much.