1: you used vinyl records in the upper left and bottom right of the pics which represented the records that you had to find in chapter 1 (i think the inner lines could be less solid to add more shine to make it look like a record, but in a speed paint you did an awesome job of that by the way

2. the top half of the biggest cog on the ink machine has 5 square spokes, with a line separating two from the other three and square leaving the middle the one separated from the other two. by this it's supposed to mean the 5 chapters in the story of the game. the first two are the chapters that you already completed and you were already had this idea out for when you decided to participate in the fan art. the square that splits the the middle one from the remaining two means that you've either yet to have completed the new third chapter or have not bought the dlc to play it (not sure how that works as i've yet to play the game myself). and the final two are the chapters that have yet to be released.

as for prize....... i'm okay not taking the prize, as the only thing i'm interested in is your amazing artwork. plus for fanart for chapter 5, find someway to get boris on the next pic and put something muscle-related. like a pun involving exercise or gym. got to make yourself stand out. though that's my opinion.

Sorry, but no. Those aren't the secrets in the pic. Good guesses though!

1. Bendy don't got thumbs
2. The way you placed the words "Bendy In" angling towards the machine makes it look like that ink from the words are placed into the machine to spew him out

Extra note: the gears and that cog on top looks like your cybernetic design for your arm, leg and side of face

And I might do that. Thanks for feedback!!