idk i know it's vague but the best way to not be creepy is just not to be creepy. be confident in what you want to say but don't make it weird. i know if you don't have much social awareness that isn't very helpful but ya know,, there's not some hard set rules for this kinda thing. just remember that someone posting sexy pictures online is not automatic consent to be sexual towards them. as long as you remember and respect that it's hard to go wrong i think