Your snake looks fine to me and at 200 grams is still in a rapid growing phase. So even if you over feed him he will quickly convert that weight to a healthy body mass. I wouldn't worry about your snake being obese until they get to the 2000 + gram range. I find it's best to keep them on the heavy side when smaller because a lot will fast in the 800 gram to 1200 gram range and you don't want them to start a fast when they are skinny.