Gaining

I'm a photo student in NYC, I'm currently working on a photo project documenting my progress getting bigger, and I'm seeking some suggestions from my fellow gainers/feeders. I'm not sure how big I'd like to get, but I'd like to at least look chubby. The question is, how much bigger do I have to get to be considered chubby? There are certain physical features I'm looking to change, like my pecs looking a lot more 'moob-ish,' my thighs touching, little bit of belly over hang, and so on. I know everyone's different and that we all gain weight in other areas, but is there a general weight you guys think that I could aim for to get these physical qualities?

Currently I'm about 185 and 6'1, if that helps, also refer to my pictures too Thanks!