Roll template styling is normally the domain of the character sheet's code. Sheet designers style roll templates based on what they expect will be included for any defined key and value. {{subtags}} was probably designed to a certain spec and large images may not have been considered. What is the issue you are experiencing with {{subtags}}? Have you tried including your image in any of the other roll template keys? What sheet? Short of modifying a sheet's code, you may be trying to force a square peg through a round hole. ;-) You also might be able to inject some inline styling <a href="https://app.roll20.net/forum/permalink/9119412/" rel="nofollow">https://app.roll20.net/forum/permalink/9119412/</a> within your macros to force the styling you desire.