I think this is a ☆me☆ question because you said IRL, but feel free to yell at me if I should have drawn the bunny answering it. I think I'm supposed to just answer this directly so it's not confusing...?
Anyway, I am and I'm not. It's complicated. Everything Eben had said about this has been essentially what I think with some slight tweeking here and there for flavor. I IRL have really gained about 35 lbs since last December, I was 155 now I'm almost 190. I do like the idea of gaining in real life, in fact weight gain and weight gain related content is really all I do like, but I have a hard time seeing myself doing it without being prompted by someone else. Sometimes I really do get into the idea so much that I'll bindge eat irl. I don't really have any interest in TRYING to gain weight, though. I don't like the dynamic. Still, I'm way too... reclusive(?) shy(?) timid(?) cowardly(?) (There's a reason I keep putting sop in my twitter handles lol) to try and find a partner for something like that. I'll probably just keep gaining passively due to my disinterest in exercise until my appetite becomes too much for my wallet.
In conclusion, Eben is my fursona. Most of, if not all, of the stuff I answer in the questions is just put-on exaggeration of my own thoughts and experiences. I'm sorry if that's been a little confusing. It's really embarrassing trying to consistently use first person pronouns for this stuff.

This seemed like a better question to answer directly, so I'll try to tell you what I think I know...
If you're going for a more realistic style, the goal is primarily to show gravity acting upon the mass. Fat is soft, but in a way that is being contained within something else. That means when it hits a surface it turns up at the edge sort of like the surface tension on a water droplet. If you have a few of those droplets on top of each other, there are parts that fold in and parts that only bend in slightly to form a little dip. The bigger the person in question is the more of these dips exist on larger surfaces without rolls. Everyone had different anatomy so the rolls and the dips will form in different places, but it's good practice to look at models or different artists to try and know where those folds lie. For example, a big one that I keep forgetting is that the love handles actually frame the fold that starts the bottom of the belly. It's little things like that which can make your character feel more or less cartoony depending on what your goal is.