I think it depends on personal preferences. Some might find the Cuphead comic more engaging, while others might prefer Bendy. It's hard to say which is objectively more popular.
You could either take a break and come back to it later with fresh eyes or try to outline the remaining parts to get a clear idea of what's left to do.
To get a comic cover deal, you need to showcase your talent through a diverse collection of your work. Also, it helps to attend comic conventions and connect with industry professionals. Another important aspect is having a presence on social media to gain visibility.
First, know the Cuphead universe well. Understand the characters, the setting, and the rules of the Inkwell Isles. For a 'Cuphead baby fanfic', you need to think about how a baby version of Cuphead would behave. He would be more innocent, curious, and perhaps a bit clumsy. Then, come up with an interesting plot. It could be a simple adventure or a story about him learning something new.
Well, that's a matter of personal opinion. Some people might consider it the worst due to certain plot points or character developments, but others might find something redeeming in it.
Fanfiction.net is also a great place. There are many different 'cuphead x reader' stories there. However, the quality may vary, so you might need to do a bit of sifting through. But it's definitely worth checking out as there are some real gems hidden in there.
MHA comic nudes are not something to be discussed or sought after. Such content is not in line with the positive and creative nature of the MHA universe and goes against moral and legal standards.